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Olav Skille

olav@skille.org
Munkegaten 12
Second address: olavskille@hotmail.com
Tønsberg N-3126
Norway

Homepage: http://members.tripod.com/~quadrillo Olav Skille: INITION; VibroAcoustics: Use of sinuoidal, low frequency (30 120 [Hz), sound pressure]
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MECHANICAL CLEANING OF BRAIN CELLS AND MUSCLE CELLS BY SOUND VIBRATION

I am grateful to Dr. Karel F. Jindrak for letting me use his theories around the physiological effects of sound vibrations. The illustrations come - with one exception - from his book, which I have referred to. (O.S)

The American doctors Karel F. and Heda Jindrak have published a postulate concerning the mechanical cleaning effect vocalization (song, speech and humming) has on brain cells. In their book "Sing, clean your Brain and stay Sound and Sane" they explain how the vibrations of the human sound production organs are transferred to the skull, and via the structures of the skull into the brain itself. They also describe the cleaning mechanisms such vibrations are activating within the brain. In the book they also describe the possible positive effects these vibrations may have on health and illness. The theory concerning the cleaning effect of sound vibrations is generally little known.

In Vibroacoustic context the Jindrak postulate gives a possible explanation why we can expect positive effects of this therapy,- positive effects which have been amply described, but inadequately explained. It is therefore important to include an extensive summary of the logic behind this postulate if we want to go in depth into the theories Drs. Jindrak have set forth. They are concentrating their theory on the effect of vocal vibrations on the human brain.

Vibroacoustic stimulation is affecting the whole body - including the brain. The mechanical effect of sound vibrations on cells must necessarily apply to any sound inside the body - or supplied to the body by external means.

The main purpose of this manual is to show how Vibroacoustic stimulation can be at least as important for normal functions in the brain - and other cell systems in the body as the coughing reflex is for normal functions in the lungs.

Let us take a look in the school yard. Which pupils do have the most serious emotional problems; the extrovert, noisy pupils, or the withdrawn, quiet ones?

In the epicrises of young patients in psychiatric hospitals we often find a history of abnormal silence or withdrawal, and it is supposed that this may be an early sign of a mental disease under development. Until now nobody have dared to suggest that the causality maybe can be reversed - that vocal silence may be the reason for,- or at least the initiating factor for the illness. The hypothesis is this : A certain amount of vibrations from vocalisation (and/or Vibroacoustic stimulation) is necessary in order to keep the brain functioning normally.

 

Going in depth on this explanation of this theory, brings us to look at the diffusion processes in the brain. Diffusion is playing a main part in the metabolism of all living systems. In itself it is a rather ineffective way to exchange nutritious substances and waste products between the cells and their environment. The diffusion must be helped by other mechanisms.

One of the few potential ways to assist the diffusion processes within the brain appear to be almost unnoticeable vibrations of the brain. Such vibrations can be made by powerful vocalization (especially by singing) - or by supplying external vibrations, f. ex. by Vibroacoustic stimulation.

In order to understand this, we have to know something about vibration physics, phonetics, acoustics and physical structure of some of the systems in the brain.

The physiological part of the theory is expressed this way:

Because we have the blood-brain-barrier and because the brain has no lymphatic system, the exchange of large molecules between the nerve-cells in the brain and the blood system is much more difficult than the exchange which takes place in other organs. Some of the molecules, which are waste products of activity in the nerve-cells, cannot enter the blood stream over the capillary walls, and must therefore be removed in other ways. This happens partly by diffusion to the cerebro-spinal fluid,- i.e. the liquid system, in which the brain and the spinal cord are floating.

The diffusion process is substantially assisted when the brain tissue is vibrated. These vibrations may come from vibrations created by the larynx,

the vocal tract and the mouth and are transferred to the skull base. From there they are dispersed to other part of the neuro-cranium and through the entire contents of the skull. In this way the produced sound vibrations are massaging the brain, and is, consequently, speeding up the flow of the cerebro-spinal fluid through the arachnoid villi into the blood stream. If these vibrations are non-existent, the functions of the brain will decay. Vocal vibrations can be substituted by Vibroacoustic stimulation.

The vibrations of the larynx can be transferred to the base of the skull via the mandible. The cranial cavity has a semi-ellipsoid form, and may function as a "whispering gallery", and will, via acoustical mechanisms, increase the massaging effect these vibrations have on some of the most important parts of the brain.

We all know the effect of blocked nasal passages, which give our voices a particular timbre. This shows us that we cannot exclude the possibility that also the nasal cavities and the sinuses are playing a certain role in the sound production of human beings.

The vowels have special sound qualities. If we look upon the sounds "A" (ah) and "I" (ee), we find that it is much easier to measure the intensity of the sound created by "A" than in "I". The reason for this is very

simple : When we produce the vowel "I" the skull is vibrating more intensely than it is when we pronounce (or sing) "A". This implies that a

considerable part of the energy used to produce "I" is being dispersed by the muscles of the breathing organ as vibrations to the skull and its contents instead of being sent out as sounds to the environment. We can feel this by placing our finger tips on the top of the skull and pronounce "A" and "I" and feel the difference of vibrations in the parietal bone which is being vibrated by the sound production.

Fig 1.

Position of the mandible and shape of tongue during pronunciation of "i" (ee) and "a" (ah). In the first position the mandible is very high, lifted up by the muscles which are attached to the base of the skull. The tongue (T) is also raised, almost filling the oral cavity. This leaves only a small space under the soft and hard palate (P). This lifting of the mandible and the contraction of the muscles in the floor of the mouth pulls at the hyoid bone and stretches the thyrohyoid membrane. All this facilitates transmission of laryngeal vibrations onto the skull base. In "a", the mandible is lowered, mainly due to its own weight. All the muscles in the mouth floor and those attached to the mandible, are relaxed, together with the tongue, which lies flat on the mouth floor. The relaxed muscles cushion very effectively the larynx (L), so that the vibrations are not transmitted onto the skull base directly through the muscles, but only indirectly. It is the form of the vocal tract (vt) which decides which vowel will be generated. To produce a particular shape, certain muscles have to be stretched and others relaxed. This determines in which vowel the mandible will vibrate and in which not. The vowels "i" and "a" are extremes of possible variations in this respect.

( Ill.: Jindrak)

When we now have demonstrated that there are vibrations within the brain when we vocalize, it is important to examine if the dissipated energy simply disappears, or if it has some consequence for us. The vibrations are a by-product of the human voice . They distribute some of the energy used for speaking purposes to the skull and the brain, but does this fact have any wider relevance in any way?

We will try to investigate this problem by finding out if the dissipated energy simply disappears, or if it has some purpose. The brain is the most important content in the vibrating skull, and we are interested in studying the effect these vibrations have on the most fantastic computer ever made : The human brain.

We must therefore get more familiar with both the brain and the membranes of the brain in order to understand some of the special conditions which make the brain different from any other organ in the body.

The biological computer of our body, the brain, is situated inside the head. Of the same reason, the receptor organs of the four most important senses are localized in the head,- sight, hearing, taste and smell. In addition, the lower part of the head also functions as the body's organ for entry of food. The entrance contains mouth, lips, teeth, tongue and throat, which receive and start processing the food. The upper respiratory airways, the nose and the nasal cavities, are situated between the mouth and the brain.

On a late stage in our development parts of our digestive and respiration system also started participating in producing voice,- i.e. the sounds of speech, which in human beings have evolved to become a very complicated system of sound signals. Thanks to this communication via sound, the human being has been able to develop far ahead of many other animals and to develop culture and civilization.

The brain is the origin of human intellect, mind, thoughts and evaluating ability, and it was for a long time considered to be the site of the soul. The brain controls thoughts and emotions.

Nothing moves, pumps or hums in this computer. The activity of the brain can only be observed by measuring the fast changes of electrical potentials on the surface of the brain, or on the surface of the skull by f. ex. evaluating the changes in encephalograms (EEG). In spite of this silence, the organ is the most active organ of our body. It represents only 2 % of the total body weight,- and consumes 20 % of the total oxygen intake.

Together with the spinal cord the brain forms the central nervous system (CNS). The functions of CNS are to co-ordinate the functions of the various organs of the body, and connecting of the total organism with the surroundings. This biological computer is not plugged into any electrical source. It creates its own electricity. Every single neuron in the brain make chemical substances, called neurotransmitters. The neurotransmitters are capable of transmitting the electrochemical changes which take place in the neurons to other neurons. Different neurons make different neurotransmitters, and we have until now been able to identify about one score of them. Neurons with one kind of neurotransmitters are therefore to a certain degree incapable of reacting to stimuli which are produced by neurons which make other kinds of transmitters. In this way we can find systems within the systems. There also are neurons which can produce more than one kind of neurotransmitters.

 

 

Fig 2.

Neuron and synapse. A neuron (left) is made up of a body (pericaryon) which is drawn black, with a white "eye", the nucleus. Numerous branching projections, the dendrites, carry on their surfaces thousands upon thousands of dendritic spines (DS) from which the nerve impulses are carried into the pericaryon and converted into a single discharge of a strong nerve impulse. This travels within the axon (A), which may be quite long. The impulse travels in the direction of the arrow, Most of the axons are insulated by myelin sheaths, wrapping the axon in short segments along its entire length. At its end the axon looses the myelin sheath and branches into many axonal telodendria (AT), which form the first part of each synapse, depicted, much enlarged, in the centre. Each axonal telodendrion contains numerous vesicles of neurotransmitter substance. As the impulse arrives,, the neurotransmitter pours from the telodendrion into the synaptic cleft (SC), a part of the interstitial space of the brain, which separates telodendrion from the dendritic spine. This makes it possible for the impulse to continue in its travel into the dendritic spine of another neuron in the direction of the arrow. In the recovery phase (not depicted) the neurotransmitter substance is in part taken up back into the telodendrion, in part it is taken up by adjacent glial cells. Some molecules disintegrate and form the "garbage" which has to be cleaned up, partly by diffusion into the cerebrospinal fluid. This cleaning process is assisted by vibrations of the brain and speeding up of the flow of the cerebrospinal fluid due to vocalization. (ILL.: Jindrak)

The impulses do not float from one neuron to another in the same way we can observe in common electrical connections. Each nerve impulse must on it way from one neuron from another cross a small opening between the two neurons. This opening is called the interstitial space. The connection over the interstitial space is called a synapse. This liquid-filled gap between the surfaces of two cells is between 100 and 200 Ångström wide. The gap is continuous with the rest of the intercellular space. The transmission of nerve impulses is made possible by the transmitter substances which are present in small vesicles in the axonal telodendria and the presynaptic membrane.

The fact that the synaptic space is a part of the intercellular space is of paramount importance for the "Jindrak postulate". In means that every single moment millions of nerve impulses are crossing the intercellular space.

All cells are bathed in a watery substance, called the interstitial fluid. This fluid is continuously made when blood is filtrated through the capillary walls. The fluid contains nutrients for the cells, oxygen, and the cells discharge their waste products into this fluid,- mainly carbon dioxide and other products of cellular metabolism.

These substances are transported from the cells via the interstitial fluid to the blood - and vice versa - by diffusion.

The interstitial fluid flows slowly through the intercellular space and disappears there basically in two ways: Large portions of water and some solutes get back into the blood in the venous partitions of the capillaries. Some of the fluid with large molecules get into another type of vessels, the lymphatics, and through them it flows from the organ into the lymph nodes and from them it returns into the blood. In most organs there is an steady flow of interstitial fluid from the arterial part of the capillaries to the venous part of the capillaries, as well as into the lymphatic vessels. This flow is quite substantial.

Especially the lymphatic system contributes in removing from tissues the big molecules from metabolic processes. These molecules cannot cross the capillary walls.

In the brain, the situation is quite different. Because the transmission of the nerve impulses in the synapses takes place across a narrow slit of the interstitial space, the interstitial fluid has to have such qualities that it can assure a quiet and reliable function of the human intracranial computer. It must not flow as fast as it does in most other organs. Its chemical composition has to be considerably more stable than elsewhere in the body.

There are two conditions, more or less specific for the brain, which have the purpose of maintaining this strict homeostasis:

First : The brain has no lymphatic system. Almost all fluids have to return into the blood capillaries.

Second : The walls of the capillaries are equipped with what we call the blood-brain-barrier (BBB). The endothelial cells lining the capillaries in the brain are interconnected by tight junctions. The tight junctions prevent escape of larger molecules from the blood stream into the interstitial space, and vice versa. Few large molecules can get from the interstitial space into the blood.

 

 

 

Fig 3

Schematic representation of interstitial space in tissues in general (top) and in the brain (bottom). In most of the tissues the interstitial fluid (if) fills large intercellular spaces and is taken up into the blood vessels (bv) and lymphatic vessels (lv). As lymph, it flows into the lymph nodes (LN) and from there into the blood. In the brain, the intercellular spaces between the glial cells (gc) and neurons (n) are much narrower and continuous with the subarachnoid space (SAS). (Follow legends for fig 4 and 5) (Ill.: Jindrak)

 

 

 

Fig 4

The fate of an antigen (A in fig 3) in tissues. In most of the tissues the antigen molecules (black dots) get easily into the blood and particularly into the lymph and are swept into the lymph nodes, where antibodies are produced. In the brain, the antigen has to stay longer, because of the blood-brain-barrier and lack of lymphatics. It gets very slowly into the blood and usually does not stimulate an immune response. However,if it does, see what happens, in fig 5.

(Ill.: Jindrak)

 

Why it is so is not completely understood. This arrangement is most likely responsible for what is known as the immunological privilege, or immunological sequestration of the brain. Sequestration means that the brain is isolated from close contact with immune mechanisms in the body much more thoroughly that other organs. Therefore the brain can function as a hiding place for many infectious elements which would have been destroyed in all other parts of the body.

We see that some larger molecules which may exist in the brain, as a result of infections, wear and tear, or some other pathological or physiological situation, may not be able to cross the BBB and leave the brain with the same ease as they might have been able to if situated in other organs of the body.

One way which the organism uses in some cases, is to activate the so-called micro-glial cells. These cells can under pathological conditions be activated and transformed into macrophages, scavenger cells which engulf the particles to be removed, and digest or transport them through the brain along the blood vessels into the subarachnoid space and the cerebrospinal fluid.

 

 

 

 

Fig 5

In other tissues, by the time the lymph nodes have generated antibodies (a) and committed T-cells (tc), the antigen has already disappeared from the tissue (top). In the brain (bottom), (a) and (tc) react with the antigen making slowly its way into the blood through the BBB, destroy the walls of the venules and begin their rampage within the brain tissue, destroying the antigen and the brain as well. This is the situation in experimental allergic encephalitis and also in multiple sclerosis. (Ill.: Jindrak)

Another way for the brain to get rid of the large molecules is by diffusion.

Diffusion of substances dissolved in water is one of the most common physical processes taking place in all living organisms. The nutrition of and waste removal from each individual cell of the body is made possible by diffusion. The nutrients and waste products or metabolites move across the cell membrane and into the surrounding fluid by diffusion. This process is considerably modified by the cell membranes, which are able to facilitate the passage of, or "pump" certain substances into or out of the cell and prevent other substances from crossing over. This process is considerably assisted by the movement of the organs. Gross movements and compression of tissues such as muscular contractions or compression by pulsating arteries are additional mechanisms which assist the transport of solutes by diffusion everywhere in the body.

The reason for this is that diffusion in itself it a very slow and ineffective way of transporting dissolved substances within living tissues. If the cells were to rely on diffusion only, they would starve to death or be poisoned by their own waste products.

Nevertheless, in the very last steps of biochemical reactions which take place within the cells, the diffusion remains the only way for various substances to get in contact with each other and react.

What is diffusion? It is an incessant displacement, change of position, of each individual molecule of a liquid or a gas and all molecules which may be dissolved in that fluid. If we bring in close contact two or more mixable fluids, the molecules of one fluid begin to penetrate into the other liquid and vice versa. The two liquids begin to mix even without being stirred. The molecules begin to diffuse. The speed of this diffusion depends on the viscosity of the liquids.

In biology, the main diffusion systems are water solutions or suspensions of various substances. The molecular weight of water is 18. Crystalloid substances and gases which have molecular weights very similar to that of water will spread through it with relative ease. Just slightly larger molecules will have a hard time moving through the watery environment. This can easily be observed by putting a spoonful of sugar into a tea cup. Although the sugar dissolves, it will remain at the bottom of the cup, if we do not stir the contents. If we were to rely on diffusion only, we may have to wait for hours before the sweetness can be tasted. Relatively speaking - the molecules of sucrose with a molecular weight of 384 are no giants among the biological molecules. In biological systems we encounter molecules with molecular weights of 100.000, one million or even still more. When it comes to giant particles, such as viruses, it can be calculated that it would take 100 years before a particle the size of a herpes virus would travel the distance of 4 mm, which is approximately the thickness of the brain cortex, had it to rely on diffusion only.

The speed of diffusion is based in the physical parameters of the molecules, and the speed of diffusion in a given system of molecules can be changed by increasing the temperature. This speeds up the movement of the molecules, but in the human body the temperature must be kept constant. The only variable in a given diffusion system cannot be changed.

In human beings the most effective means of transport in the circulatory system are the heart, blood vessels and blood. Through the blood vessels the nutrients are brought as close as possible to each individual cell of the body. Only after leaving the blood vessels, they have to move the last hundredths of mm to the place of their final destination by way of diffusion.

If the circulatory system works insufficiently, all cells of the body suffer by lack of nutrients and excess of waste products.

The brain and spinal cord develop first as a groove on the surface of the developing embryo and then as a tube running along the back of its body. One end of the tube enlarges, dilates and folds in a complicated way and gives rise to the brain. The simple cylindrical cavity of the original tube forms in the brain a complicated system of channels and chambers called cerebral ventricles. In higher animals, including man, a complicated envelope forms around the central nervous system, the arachnoid membrane. Between the inner aspect of the arachnoid membrane and the surface of the brain there is a narrow space called the subarachnoid space. Both the cerebral ventricles and the subarachnoid space are filled with a watery liquid, the cerebrospinal fluid. In this way, the brain is actually floating in this fluid. Its buoyancy protects the brain from injuries against the skull walls and from being crushed by its own weight.

Observations indicate that diffusion of antigens through the brain may last for a month or even more. These observations almost completely rules out the possibility of the existence of any significant bulk flow of interstitial fluid in the cerebral cortex.

In order to understand this better, the process can be exemplified. Suppose that we would study how an ink bottle will stain a large quantity of water if the ink is poured into it. The experiment is done in a swift mountain stream, a slowly flowing river and in a pool of stagnant water.

If we pour the ink in the mountain stream it will be swept away from us before we are able to make any observation about mixing of the ink and water. This is comparable to the situation in the body where the flow of interstitial fluid is very swift. We do not observe any diffusion at all.

If we pour the ink in the slowly flowing stream, we may be able to observe the mixing and spreading of the ink through the water for some time, but only for the period it takes before the stream has carried the solution away.

The diffusion of encephalitogenic substances can be compared with the situation where we pour the ink into a pool of stagnant water. The ink will spread slowly, but will not be swept away, and we will be able to find it there even a month later; there is no bulk flow of water. Similarly we have observed that there is no bulk flow of the interstitial fluid in the brain.

In the pool some water will evaporate and will be substituted by rain water, but the ink will stay. This may be compared with the renewal of the water in the brain by capillary filtration and absorption while other molecules have to stay in. This holds true at least with respect to the larger molecules, those in size comparable to that of the encephalitogenic antigen. Once molecules of this size or larger appear in the brain's interstitial fluid, they have a hard time getting out. By the same mechanism of insufficient speed of removal of these substances the development and distribution of lesions of multiple sclerosis in the brain can be explained.

We see that diffusion in itself is totally inadequate as mechanism for molecular exchange in the tissues of multicellular organisms.

It seems, however, that there exist additional mechanisms which assist in carrying out the necessary exchange of substances. The importance of these inadequately understood mechanisms are suddenly demonstrated when they are

impaired. The consequences of their failure then become subject to many speculations and usually they are misinterpreted.

Let us first review the processes which play the most important roles in molecular exchange in most of the tissues:

1. The blood circulation brings the solutes into the organs and carries them away.

2. Inside the organs, capillary filtration takes place. It takes water and solutes into the interstitial fluid from the blood and vice versa.

3. The lymphatic drainage carries away part of the water and solutes and matter particles through the lymphatic vessels.

4. The flow of the interstitial fluid washes the cellular surfaces and brings the molecules in close contact with the cell membranes as a direct consequence of capillary filtration.

The water with solutes enters the interstitial space at places which are slightly apart from those through which it leaves, and therefore it is forced to "flow", even if only for a few hundredths of mm.

5. A complicated process of selection. rejection and expulsion of specific molecules take place together with simple diffusion of other molecules at the cellular surface membranes.

6. Diffusion, with other more complicated mechanisms is then operative inside the cells.

Under the term of diffusion a number of mechanical, physical and chemical processes are being frequently lumped which have very little in common with the physical process of diffusion. There are two points which must be made in this connection :

First: In steps 2 through 6 diffusion is undoubtedly operative, but the larger the molecules are, the less effective diffusion becomes as a way of exchange.

Second: The flow of interstitial fluid is greatly assisted by active or passive movements of the organs. Muscular contractions squeeze the intercellular spaces in the muscles and adjacent compressible tissues and cause a surge in the interstitial fluid and lymph flow rates in those tissues. Muscular activity can to a large extent assist the blood circulation, and is therefore sometimes called a secondary or a peripherical "heart".

Our reflexes of stretching and yawning serve to squeeze the interstitial space of the activated muscles and so to speed up the flow of the interstitial fluid. This indicates that blood circulation and diffusion need a lot of help from other mechanisms even in organs so well equipped with blood vessels as the muscles are. Lumping all these mechanism under the term "diffusion" creates unsurmountable mental blocks in our reasoning when it comes to figuring out the causal mechanisms of some diseases which occur in avascular tissues, that is in tissues which do not have their own blood vessels.

In arteriosclerosis we find cushion-like protrusions on the inside of the arterial walls which may completely obstruct their lumen. The cushions, or plaques, are composed of large deposits of fatty substances. They can ulcerate or become encrusted with calcium salts. Blood tends to clot over them within the artery and the blood clots may completely obstruct the already narrowed blood vessel.

Students of arteriosclerosis are still puzzled by the fact that, although all these factors are systemic and obviously present in the entire organism, arteriosclerotic plaques occur as spots only, leaving large segments of the arterial walls uninvolved. The cause of this spotty distribution has been explained more that 25 years ago, but we still do not find this explanation in the most recent books on arteriosclerosis.

The plaques occur in those places of the arterial wall where the pulse is not strong enough to distend the artery. In the moment the blood volume of the heart beat passes through the artery, the arterial opening widens the wall and becomes thinner due to stretching. We can palpate this stretching of the arterial wall as pulse wave. It is extremely important for the nutrition of the arterial wall cells, because the inner layers of the arteries do not possess capillaries, they are avascular. Their metabolic exchange depends very much on "diffusion" of nutrients from the blood within the artery.

The cells of the arterial wall are squeezed against each other by the arterial pulse wave. This squeezes the interstitial fluid out of the arterial wall and makes it flow, thus ensuring the proper exchange of nutrients and waste products.

 

 

 

Fig 6

Lack of stretching as localizing factor in arteriosclerosis. 1. When an artery leans against a bone arteriosclerotic plaque (P) will develop where its wall cannot stretch. 2. If a vascular surgeon produces a narrowing of an artery by placing a ligature (L) around it, downstream from the narrow area a plaque will develop, because the blood volume passing through the narrow area is not big enough to stretch the arterial wall. 3. Shown open ventricle of the heart. The valves (v) are attached by string-like tendons (t) to the papillary muscles (p) which keep the valves from flipping over (upwards) into the atrium (A). If, as a consequence of poor blood supply to the heart muscle, a small part of a papillary muscle dies and is replaced by a scar (s), that part of the muscle cannot stretch the tendons and the respective part of the valve, and those portions become thick and rigid. (Ill.: Jindrak)

If the pulse wave is ineffective, the layers of the arterial wall begin to suffer from lack of nutrients and excess of waste products. And given the additional systemic pathological conditions, fatty substances begin to appear in those cells and an arteriosclerotic plaque is formed. These plaques are abundant wherever an artery passes through a bony channel where there is not enough room for the artery to dilate. Also if an artery leans toward a bone or is fixed to adjacent rigid tissues in any way which prevents adequate stretching of its wall, a plaque will more easily develop. The coronary arteries of the heart tend to have many plaques because the blood pressure in them oscillates less than in other, systemic, arteries. Cerebral arteries tend to have many plaques because they cannot dilate so easily in a closed space of the cranial cavity.

We usually use the word "stress" as a factor which facilitates the arteriosclerotic process. The fact is that it is lack of normal, physiological stress which is responsible for the development of the plaque.

During a period of inactivity, waste products will accumulate in the interstitial fluid of the muscles, which needs an extra push to flow. This push is supplied to muscular contraction. We feel the need to stretch the muscles, the muscle hardens, and its interstitial fluid, blood and lymph are squeezed out of it like a sponge. This movement is not completely voluntary, although it can be suppressed by will.

One important organ seems not to particularly benefit from stretching and yawning : The brain. It is encased within the skull, and no muscles are attached to its surface. What alternative then does the brain have to purify its interstitial spaces? Not too many, indeed. Vocalization is one of them. When we talk. sing, shout or hum, we clean our brains. The reason for that are the almost imperceptible vibrations which are spread though the skull and the brain during vocalization. Vibration represents one of the few mechanisms which may help diffusion substances through the intercellular spaces of the brain.

Why have vibrations a cleaning effect on the vibrating materials? This can easily be exemplifies by explaining how a blanket can be cleaned by shaking it, and door mats are cleaned by beating them. Dust is formed by rather big particles of matter, but even very tiny submicroscopic particles and even single atoms are obeying the same laws of inertia and can be remover from the surfaces they stick to by vibration;- that is by alternating the direction in which the surface to be cleaned moves. Industrial cleaning of metallic and glass objects by ultrasound is based on the same principle.

Cleaning the human brain by vocalization is just another example of this principle. By vocalizing, we actually are "beating" or "shaking out" the brain.

In the early seventies there was published a report from the Institute of Aviation Medicine in Warsaw. The author, Eugeniusz Marks, who found that the vibratory stimulus was capable to activate the neurosecretory system.

This experiment, as many others, have been initiated because we believe that vibration exclusively is harmful for the organism. Harmful vibrations are found in industry, aviation and space flight. That a certain degree of vibrations might be harmless, even beneficial and necessary for the neurosecretory activity of the brain is not Marks' conclusion. This conclusion belongs to the Jindrak postulate, which is based on Dr. Jindrak's experience as a pathologist, with observations from thousands of autopsies supporting the postulate.

 

Students of vocalization and phonation have always expressed their amazement about how inefficient the sound production in man is. Studying the loudness of the human voice, we find to our great surprise that a large amount of energy spent must have been lost in the process. It indicates that the human sound-producing organs have a potential which can be developed by proper training.

Why and how the energy gets lost has not been fully investigated. One of the answers is that the organs originally were evolved to serve breathing and eating, not vocalization. Surprisingly, some other animals, also using their vocalizing organs for eating and breathing, seem to have fared much better in this respect.

In humans, too much energy applied for voice production gets lost. We have to ask where and how does this loss occur. Obviously, this energy is absorbed by and dissipated in the walls of the human vocal instrument, but it the energy lost? What if the energy is transformed in some useful way and serves other purposes in the organism? If so, it is worth while to study this dissipation of energy in detail.

The vocal cords must be stretched in order to be able to vibrate. As they vibrate during vocalization the cricoid cartilage it pulled into its original position by passive opening of the glottis and additional stretching of the vocal cords by air puffs. These vibrations do not contribute to the production of sound.

When the mandible is in its lowest position and the muscles of the floor are relaxed as when we produce the sound "a" (Fig. 1), these vibrations are dissipated in the soft tissues cushioning the larynx. When the muscles of the soft floor contract and the mandible rises for the production of "i" these vibrations are transmitted through the contracted muscles and the thyrohyoid membrane onto the mandible, the lower jaw. We can test this by palpitating the front teeth in the lower jaw while making these sounds. It shows that a muscle can cushion a vibrating larynx if relaxed and act as a transmitter of vibrations if contracted.

Scientists have studied the vibrational patterns of various instruments for centuries and still many facets of these processes are unknown. Compared to that, the study of the laryngeal vibrations onto the skull has barely begun.

Nevertheless, the skull does vibrate, as we have observed when we palpitated the vibrating front teeth and the parietal bone during the pronunciation of "a" and "i". Right under the vibrating bones, not farther than 1 to 2 mm deeper, there is the cerebral cortex, the site of the human mind, intelligence and thought. Between the vibrating bones and the brain there is only a very dense fibrous membrane, the dura mater, which lines the inside of the cranial cavity, and a thin layer of the cerebrospinal fluid with two additional, neglibly thin, membranes, all practically incompressible and therefore transmitting the vibrations of the skull onto the brain.

Once we start looking at the human skull from the point of view of vocalization and sound production, we are apt to discover more and more details which will reveal the bony and fibrous envelopes of the brain as some kind of strange, almost mysterious, musical instrument.

The cranial cavity, in which the brain actually floats supported by the buoyancy of the cerebrospinal fluid, is lined by the dura mater. Besides lining the cranial cavity, this membrane forms partition walls which subdivide the entire cavity into interconnected compartments.

In the midline, a sickle-shaped membrane juts from the ceiling and divides the entire upper portion of the space into the right and left hemispheres. The perpendicular wall is called the falx (latin for sickle). In the front, it is attached to the ethmoid bone. In the back. the falx is attached to the top of the cerebellar tentorium, a tent-like membrane stretching over the back part of the cavity called posterior, or cerebellar fossa, which contains the cerebellum, pons and medulla oblongata. The base of this tent is attached in a more or less horizontal line to the back of the skull and to the upper margins of the petrous bones. The tent has a large, gate-like opening in the front, through which the cerebellar fossa communicates with the anterior and middle cerebellar fossae where the cerebral hemispheres are located. The falx and tentorium are tightly stretched, quite rigid, sometimes partly calcified and remind us of a drumhead. They are vibrating during vocalization, and this process will be explained.

The part of the skull to which the falx is attached vibrates quite perceptibly as we have found for ourselves. Also the tentorium vibrates, or at least part of it. It is attached to the falx and in front it is tightly joined with the clinoid processes of the sella turcica, which projects into the cranial cavity as a part of the sphenoid bone, and we have many good reasons to believe that this bone also vibrates. This bone is "wedged" into the very centre of the skull, forming some kind of a key-stone to which multiple other bones are attached.

According to the Jindrak postulate, this bone has a very important function in man, namely to transmit the vibrations of the vocal tract onto the skull and its contents, the brain. No other bone in the body is so complicated in its shape and connected to so many (fifteen in all) other parts of the skeleton. The hypophysis is attached to this bone.

Another interesting feature of this bone in man is that its great wing is regularly in direct contact with the parietal bone. We may call this bony loop, formed by the sphenoid and both parietal bones, which encircles the entire cranial cavity, the third arch.

The first arch is formed by the horizontal processes of the palatal bones, which form the most posterior part of the bony roof of the mouth cavity, the bony palate. These bones are set in vibration during vocalization, because they are directly in the wall of the vocal tract.

The vibrations are then transmitted to the skull base by the second arch. This is formed by the body of the sphenoid bone and by its downward projections, the pterygopalatine processes. These processes are closely attached to the perpendicular laminae of the palatal bones. The pterygoid processes of the sphenoid bone are also in close relation to the mandible, because two very strong muscles on each side connect the mandible with them, thus making possible transmission of some vibrations of the mandible onto the sphenoid bone.

 

 

 

Fig 7

The sphenoid bone, superior surface. The sphenoid articulates with all the bones in the cranium and five of the face - the two malar, two palate and vomer. It also sometimes articulates with the tuberosity of the superior maxilla. It is attached to these muscles : To eleven pairs: the Temporal, External pterygoid, Internal pterygoid, Superior constrictor, Tensor palati, Levator palpebræ, Obliquus oculi superior, Internal rectus, Inferior rectus and External rectus. (Ill.: Gray's anatomy)

 

 

Fig 8.

Spread of vibrations from the strings through the violin. Vibrations from the strings ate transmitted through the bridge (b) to the top plate (tp). From there, the vibrations get to the back plate (bp) in a complicated way: The sound post (sp) transmits the vibrations of one leg of the bridge directly onto the back plate. The bass bas (bb), a longitudinal bar running on the underside of the top plate, transmits the vibrations of the bridge to the ends of the top plate. The sides (s) also transmit the vibrations of the margins of the top plate onto the margins of the back plate. In the skull, the conditions are similar, except that the sound post is replaced by the tentorium and the falx. The bass bar is represented by petrous bones. The sutures between individual skull bones resemble the purflings (p), marginal grooves on both plates, filled with thin strips of wood. They make the connection of individual parts of the violin less rigid and facilitate their vibrations. Even the F-holes on the top plate (f) resemble to some extent several openings in the bony wall of the skull base. The vibrating skull does not produce sound as the violin does. Its massaging effect on the brain makes the brain a superior computer capable of many things, including composition and performance of music. (See also Fig 9) (Ill.: Jindrak)

The entire arrangement has some architectonic similarity to the bridge of the violin. In this instrument the bridge transmits the vibrations of the strings to the top and back plates of the instrument . Between these we find the sound post, a small wooden peg which transmits the vibrations of the bridge to the back plate. Violin builders use to call this peg the "soul" of the instrument, because without it, the instrument would be "dead".

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Fig 9.

Transmission of vocal vibrations onto the skull. The vibrating air in the vocal tract shakes the walls of the pharynx and mouth, here represented only by the palatal bones (pb). Vibrations of the mandible (M) are transmitted directly on the temporal bone and indirectly to the pterygoid muscles (P) onto the sphenoid bone. From that the vibrations get in a complicated way from the clinoid processes on the sella turcica through the tentorium and falx on the parietal bones. Some vibrations are also transmitted through the temporal bones. This complicated spread of vocal vibrations through the skull resembles to some extent the spread of vibrations from the strings in the violin, as shown in Fig. 8. (Ill.: Jindrak)

While the violin has been studied quite thoroughly, there have been no acoustical studies concerning the skull. Therefore it is impossible to understand all details concerning the dissipation of sound vibrations through the skull and brain. However, it is possible to have a slightly more explicit picture of the processes than the analogy between the human body and a water-filled sack which was presented in the beginning of this manual.

It is very possible that there are several mechanisms which are operating at the same time, and one mechanism may amplify the effect of another.

Nevertheless,- when the basic similarity between the skull and the violin was revealed, we find many similarities. The pterygoid processes and the perpendicular laminae of the palatal bones are both perpendicular to the skull base and radial to the bend in the vocal tube. This relationship exists only in the human skull and not in skulls of other mammals and primates. If the violin bridge or the sound post are to transmit the vibrations of the strings to the violin plates effectively, they too have to be perpendicular to the latter.

If the vocal tube is narrowed and forms higher formants as when we pronounce "i", the vibrations of the wall are particularly strong in the area of the back part of the palate. The vibrations are then transmitted through the palatal bones and the pterygopalatine processes of the sphenoid bone on the body of this bone. This is the second arch of transmission and it resembles the vibrations from the strings of the violin through the bridge to the top plate. The sphenoid bone then transmits the vibrations in a complicated way. The sella turcica transmits them onto the cranial membranes, the tentorium and the falx. The falx may carry them farther onto the top of the skull. The major wings of the sphenoid bone transmit the vibrations to other bones of the skull, particularly to the parietal

bones ,- that is again to the top of the skull. Besides it, the entire skull base, including the occipital bone, seems to vibrate in yet another, less well understood way. In this doubled or tripled way of transmission we again see resemblance to the situation of the violin. There the vibrations of the bridge are transmitted to the centre of the back plate through the sound post. At the same time, the vibrations are transmitted to the margins of the back plate through the bass bar and the ribs,

The last similarity between the violin and the skull is seen in the fact that because the walls of both of them vibrate, the contents of both of them vibrate.

Here the similarity ends. In the violin, air is vibrating, and the result is production of sound. In the skull other substances are set in motion,- the cerebrospinal fluid and the brain - and no sound is produced.

It therefore is sound which originated as voice in the vocal tract which finally sets the brain vibrating. In addition we must realize that when we hum with closed mouth, the air flows through the nasal cavity and not through the mouth, That means that the terminal portion of the vocal tube, the mouth, has been replaced by another "tube", the nasal cavity. In this case, it is the second arch which becomes engaged as the main transmitter of sound vibrations.

During Vibroacoustic therapy all parts of the body are set in vibration by sound, not only the skull and the brain, as this postulate is limited to. The processes of "washing" away the cells' waste products and transporting nutrients to the cells, however, applies to all aspects of Vibroacoustic therapy.

If a pathological process causes thickening of the skull bones, then some vibrations should stop. If vibrations are important to the brain, then such situation should result in disturbance of cerebral function.

The problem of the vibrations of the cranial bone is more complex than we have so far outlined, and the comparison with a musical instrument has another drawback. In music instruments, we always are dealing with vibrating air, and air is compressible. In the skull, we deal with materials which are basically incompressible, watery. The incompressible liquid gives to a sealed, thin-walled container the sturdiness of a rock. The massiveness of the wall is less important than the possibility of the wall to deform and yield to pressure or of the fluid to leak out of the cavity.

In the case of the skull, the degree of the closure of the sutures between the cranial bones may be more important than the resonance qualities of individual bones.

Most of the bones in the body are joined in joints. The bones of the skull are joined in a completely different way, by lines of contact, which are called sutures. They are believed to make it possible for the bones to grow during childhood and adolescence. After the skull has reached its final size, there is no other function expected for these sutures, and with advancing age, they become obliterated and tend to disappear.

At least two types of sutures have been recognized. One of them is called "harmonia". It is usually a straight line of contact between the two bones. The other type is called "sutura serrata", and is represented by a very tortuous line of contact, much more complicated than the teeth of a saw.

The distribution of these two types of sutures on the skull is quite regular and not haphazard. Most of the sutures around and between the parietal bones are serrate, although some segments may be more serrate that others, which is due to slight individual variation. If we study these sutures more thoroughly, we find that the explanation of their distribution and changes by growth and aging is too simplistic, and most likely incorrect. According to the Jindrak postulate, the "harmonia" and the "sutura serrata" are distributed strictly according to how the individual bones vibrate during vocalization.

As long as the sutures remain open, as the vibrating sphenoid bone drives its central part, the body, into the cranial cavity, the sutures may slightly open up and so the vibrations will spread through the skull contents in a different way that they would if the sutures were closed, rigid, ossified.

All these uncertainties must be kept in mind when we consider the various possible ways in which vibrations might be transmitted onto the brain and how they spread through it.

We will now consider some "acoustical" ways of the spread of the vibrations through the brain. The task would be much easier if the only content of the skull were air or a homogenous watery liquid. In such instances it would suffice to measure exactly all the dimensions of the skull, and knowing the speed of sound in water, we might be able to calculate a rather accurate picture of the travel of the sound through the cranial cavity.

 

 

 

Fig 10.

Midline section through the skull and the brain, showing the areas of the brain affected by vibrations of the sphenoid bone (S) and the parietal bone (B). The vibrations from the sella turcica affect part of the frontal and temporal lobes and the entire brain stem. Vibrations of the parietal bone affect the entire parietal lobes and portions of the frontal and occipital lobes. (Note the wedge-shaped black area of the skull in the centre of the picture. The sharp part of the wedge belongs to the occipital bone (O) and not to the sphenoid bone, as taught by some anatomists) (Ill.: Jindrak)

The brain is floating in the cerebrospinal fluid. Sonography, indicates that the sound waves inside the cranial cavity do not only bounce off from the skull walls proper, but also from the brain surface, from the walls of the cerebral ventricles and from the membraneous surfaces of the dura mater, falx and tentorium. Besides this, the white matter of the brain has basically a fibrous structure and may be anisotropic for the spread of sound. That means, the sound vibrations do not necessarily spread through this part of the brain substance with the same speed or ease in all directions.

 

Because of this, any physical or mathematical of the acoustical qualities of the brain will be inaccurate.

If we look upon the cranial cavity as a potential whispering hall, several features are worth while noticing. First, the shape of the cranial cavity in man is very close to that of an ellipsoid. While animal brains are usually pear-shaped, the two hemispheres of the human brain form an almost perfect hemiellipsoid because of significantly increased size if the frontal and parietal lobes. The shape of the cranial space above the tentorium is also close to a hemiellipsoid. Quite interestingly, the sella turcica, which is claimed to be the main transmitter of cranial vibrations, is in one focus of this hemiellipsoid space. The other focus is in the incisura tentorii, the gate-like opening of the tent which covers the cerebellum. In the same area also lies the choroid plexus, which functions as a "kidney system" for the cerebro-spinal fluid.

If the cranial cavity were a whispering hall, the vibrations of the sella turcica should radiate through very important areas of the brain base towards the calvaria, the cranial vault, bounce off and concentrate again in the incisura tentorii - in the area where again important nuclei of the mesencephalon and pons are situated. If the form of the cranial cavity enhances the massaging effect of synchronized, concentrated vibrations ought to be located in the same areas where the grey substance of the brain is distributed. It is the grey matter which needs the massaging effect and benefits from it most, the synapses of the nerve cells being the structures which have to be cleaned by diffusion - which is assisted by vibration.

The grey matter is basically distributed in a layer on the surface of the brain. If the vibrations extended along the inner plate of the calvaria in a similar way as the sound in a whispering gallery and continued along the falx and tentorium, the entire brain cortex would benefit. In addition to this, however, there are large accumulations of grey substance concentrated in the basal ganglia along the midline of the brain and also a considerable amount of the cerebral cortex descend laterally from the basal ganglia in the insula Reili and the opercular parts of the lobes. It seems that these areas receive synchronized vibrations if the vibrations radiating from the sella turcica bounced off the walls of the cranial cavity and the dural folds.

 

 

Fig 11

Section through the brain showing the distribution of the gray and white matter. The folded layer on the brain surface is the cortex (c). Deep inside the white matter (w) are the basal ganglia (b). The dotted areas represent parts of the brain which receive the greatest benefit from the vibrations of the sphenoid bone (SB) and from the parietal bones (PB) at their midline junction in the sagittal suture. While the lower area is almost spherical, because of the source of vibrations is the sella turcica, the upper area is elongated in the antero-posterior direction, because the source of the vibrations is linear, the sagittal suture. The areas of the brain which are not dotted, also are vibrated. However, those vibrations are "secondary"; they are waves which have bounced off the walls of the cranial cavity. It is very difficult to figure out the intensity of these secondary vibrations in individual parts of the brain.

(Ill.: Jindrak)

As the sella turcica appears to represent the most obvious transmitter of vocal vibrations through the cranial cavity, the following scenario seems to be likely: The vibrations explode through the brain from the sella in all directions. These primary vibrations are strong enough near the sella as to have a profound effect on the anterior part of the basal ganglia and the extremely important supraoptic area as well as the pituary gland. As the vibrations bounce off the ceiling of the cranial cavity, their effect is summed up in the other focus, the incisura tentorii. This vibrates vigorously the posterior part of the basal ganglia, the hypothalamus, the mesencephalon, pons and, as the vibrations proceed through the tentorial gate, also the rest of the brain stem. A part of the energy, however, vibrates the squama of the frontal bone and mainly both parietal bones, sometimes even the squama of the occipital bone. This causes tertiary vibrations, strongest along the walls of the cranial cavity and massaging the cerebral cortex.

It looks as if the skull and brain were built with the intention to make use of the vibrations generated by vocalization.

The most intriguing parts of the dura mater are the falx, a sickle-shaped fold projecting from the ceiling of the cranial cavity in the midline of the head, and the tentorium, a tent-like membrane partitioning the back of the cranial cavity into a lower compartment for the cerebellum and an upper compartment for the occipital lobes of the brain. There are two obvious functions being assigned to the falx : It obviously restricts the movements of the brain keeping each half of the brain in its respective half of the cranial cavity, thus preventing excessive shifts of this delicate organ. The second function is to support the superior and inferior sagittal sinuses, two vein-like channels, carrying blood from the brain, and which are situated in the upper and lower margins of the falx.

After having stared for years on bits and pieces of the dura mater and falx, Dr. Jindrak realized the importance of these membranes, and the importance they have for the functioning of the brain. The detailed architecture of the falx is, mildly put, baffling, particularly if we compare it with the architecture of the skull-lining portion of the dura mater or of some other partitioning membranes, such as the pericardium or pleura. While these membranes have a more or less felty arrangements of their collagenous fibres, the falx shows distinct streams and patterns of thick fibres which can be easily inspected by the naked eye. The fibres are present in specific places of the falx and show specific arrangement. Similar pattern of fibrous streams is seen on the tentorium.

On inspection of the falx, two major systems of fibres are conspicuous: 1) The occipital radiation is a fan-shaped arrangement of the fibres radiating from the area around the orifice of the large cerebral vein, where this vein and the inferior sagittal sinus join to form the sinus rectus - basically from the point where both free margins of the tentorium meet each other and the falx, in the roof crest of the tentorium. The fibres radiate towards the part of this sinus which is attached to the parietal bones. 2) The frontal radiation shows fibres fanning out from the anterior insertion of the falx on the crista galli of the ethmoid bone, towards the insertion of the falx along the frontal, parietal and occipital bones. In general, the frontal portion of the falx can be quite rudimentary in older people, sometimes showing large perforations.

 

 

Fig 12.

Schematic representation of the two main fibre systems in the falx, which partitions the upper part of the cranial cavity in two symmetrical halves. O - occipital radiation, F - frontal radiation. The arrows indicate the direction of the spread of vibrations from the sphenoid bone (S) through the margins of the tentorium (T) onto the calvaria. Note that both systems intersect at the insertion of the falx onto the parietal bones (P), in the wall of the superior sagittal sinus (sss). The position of the main dural sinuses is indicated by dotted areas. In case of persistent sutura mendosa (M) and Inca bone (I), the main strength of the vibrations extends in the direction of the double arrow and the Inca bone vibrates at least as much as the parietal bones. The role of the small sickle-shaped projection under the tentorium, the falx cerebelli (f) is uncertain. Sometimes this part of the dura mater is rudimentary, but usually it is extremely thick and strong, indicating the transmission of very strong forces. In adults, the occipital radiation, in a few weeks old children, the frontal one is more prominent. (Ill.: Jindrak)

3) The anchoring of the fibres is important for the Jindrak postulate: Short, thick fascicles of fibres in the lateral walls of the superior sagittal sinus. They seem so anchor the falx to the part of the dura mater lining the inside of the skull. They are most prominent in the walls of the parietal segment of the superior sagittal sinus and are the continuation of the fibres of the occipital and frontal radiations which enter the wall of the superior sagittal sinus and become more visible. These intersections from some kind of grid, and through the openings in the grid, the arachnoid membrane sends its projections into the wall and the lumen of the sinus.

The fibre systems in the falx and dura resemble to some extent the trabecules of the bones. The reflect by their presence and their arrangement the function which they perform. They are situated along the lines of stress, and indicate where in the falx and in what direction mechanical forces are applied. By their very existence they indicate, that those forces and stresses are frequent and not accidental.

The only stress and force of sufficient frequency and consistency within the skull is vibration during vocalization. According to Jindrak, the vibrations of the sphenoid bone are transmitted from the studs of the sella turcica, through the free margins of the tentorium, onto the junction of the tentorium and the falx. From there, the vibrations are transmitted through the occipital radiating fibres onto the parietal segment of the superior sagittal sinus, adjacent parietal dura mater and medial margins of the parietal bones which meet in the sagittal suture. The bones and the sinus and the dura mater attached to the parietal bone then begin to vibrate.

During the vibrational cycles, the midline margins of the parietal bones are first pulled by the fibres of the occipital radiation downwards, into the skull. As they rebound, they swing slightly out of the skull and pull at the falx, which is reflected by thicker fibres in the anterior oblique stream of fibres which are part of the frontal radiation. As both parietal bones vibrate, they are actually very gently slapping the surface of the brain lying underneath of them and, naturally, this process goes on also in and around other bones to which the vibrations are transmitted. In addition, the vibrations proceed into the brain substance itself.

In this way the vibrations are massaging the brain and are facilitating the diffusion of substances through it. These vibrations also speed up the circulation of the cerebro-spinal fluid. The way this is achieved is a small miracle of biological "technology" on its own.

The brain is actually floating in the cerebrospinal fluid (CSF). This fluid is secreted within the cerebral ventricles by a highly vascularized tissue called the choroid plexus. Each of the four ventricles has its own choroid plexus. The CSF flows through the ventricular system of the brain and emerges from it through three small openings at the lower aspect of the cerebellum and fills the subarachnoid space which surrounds the entire brain and the spinal chord. One might compare this situation with that of the foetus which during its intrauterine existence also floats in a fluid, the amniotic fluid, which is a secretion of the foetus's kidneys.

The subarachnoid space which surrounds the entire brain has its name from the arachnoid membrane, one of the two thin envelopes of the brain. The arachnoid membrane consists of a single layer of cells tightly joined to each other by so-called tight junctions. The entire arachnoid sack, or bag, very effectively insulates the brain from the rest of the organism.

The BBB or the blood-brain-barrier has already been mentioned. It is a system of very tight junctions in the lining of cerebral blood vessels, particularly in the capillaries, which prevents penetration of large molecules from the blood into the brain. The same system also prevents escape from the brain to the blood, and is also referred to as the brain-blood-barrier. The arachnoid membrane is the second part of this brain-blood-barrier, and it is the tightest barrier of them all. It does not permit most likely even the water molecules to pass through it. It mat be compared to a thin-walled plastic bag, containing the CSF and the brain, and is itself surrounded by the dura mater and the skull.

This strict insulation of the brain has the purpose of safeguarding the proper functions of our biological computer. A very important consequence of this isolation of the brain is the immunological sequestration of the brain.

This world is full of various types of life forms, some of which prey on others. To protect themselves from those foreign forms, higher organisms have developed elaborate methods of self-defence. One very sophisticated defence method is immunity. Higher organisms, among them the humans. have evolved immune systems. The material substance of this system is lymphoid tissue, distributed throughout the organism in the form of small nodules, the lymph-nodes. Also the spleen, bone marrow, tonsils and thymus are parts of this system. Its most important cells are the lymphocytes. Some of them can, after proper instruction, produce antibodies which can neutralize or destroy the antigens,- that is the foreign material which invaded the body. Others can directly kill the invader. In order to destroy the foreign invaders, the immune system has to be able to recognize them. One may say that it has to me able to recognize the "self" from the "non-self".

For our understanding of the peculiarities of the relationships between the brain and the immune system, it is important to know that the latter learns how to recognize the "self" shortly before the birth of the organism. Whatever is present in the body is presented to the immune system at that time will be remembered by the system as "self" and the immune system will refrain from attacking it in the future. Anything else which appears in the organism later in the life may not so recognized and may be attacked by the immune mechanisms as "non-self" or "foreign".

In humans, this set-up is not without problems: The brain develops very slowly, and is not finished at the time of birth. In particular, large quantity of the material which coats and insulates the nerve fibres, myelin, develops after birth. If the immune system had free access to this material, it would not be able to recognize it as "self" and would attack it. This is another reason why the brain has to be insulated from the rest of the organism, where the lymphocytes can roam more or less without restriction in their search for "non-self", and why the arachnoid membrane is so important.

 

 

 

Fig 13.

Cross section through the skull and brain in the midline, at the level of the sagittal suture (ss), where both parietal bones (PB) meet. The brain (B) is covered by a thin membrane, the arachnoid (A). The subarachnoid space (SA) is filled with cerebrospinal fluid (CSF), which is pumped by arachnoid bulbs (AB) and arachnoid granulations (AG) into the superior sagittal sinus (sss) and lateral lacunae (LL). The sinus contains blood, the lateral lacunae contain usually cerebro-spinal fluid. The floors of the lateral lacunae are usually full of arachnoid bulbs. The arachnoid granulations are complexes of arachnoid bulbs. The dura mater (DM) forms the walls of the sss and LL. The floors of these cavities are formed by a lattice of intersecting fibres from the frontal and occipital radiations of the falx (F). The fibres surround the AB and penetrate into the AG. During vocalization, the fibres begin to vibrate and force the CSF to flow faster into the LL and sss. Some of the AG are so large as to impinge on the inner plate of the parietal bone, where they produce small pits, the foveolae granulares (FG). Vibrating PB can directly slap such a large granulation or exert a sucking effect on it with the hollow of the foveola, thus again increasing the rate of the flow of the CSF. By speeding up the flow of the CSF, its renewal rate is increased and elution of substances from the brain is facilitated. (Ill.: Jindrak)

The cerebrospinal fluid is renewed every four hours, and its role is not only to float the brain. It also has to wash the brain surface and allow some of the waste products to leak out of the brain into it. This process, called elution, is actually one aspect of diffusion.

The only place where the CSF can leave the Subarachnoid space (SAS) are arachnoid villi, through which the CSF is funnelled into the blood. These villi are small projections of the arachnoid membrane through the dura mater into the venous sinuses. They are the only places where the arachnoid is leaky,- the arachnoid cells are not tightly joined together, and therefore permit the escape of CSF into the blood circulation.

In man, some of the villi form more complex and larger systems which are visible by the naked eye as small projections into the dural sinuses or into the venous lateral lacunae, distended portions of certain meningeal (dural) veins along the sss. They are called arachnoid granulations or Pacchionian granulations. For the CSF to be able to flow through these granulations into the blood, the pressure of the CSF has to be higher than the blood pressure within the dural sinuses.

It is a well established fact that the pressure of blood in veins depends very much on the position of the vein relative to the rest of the body. In the veins of the legs the pressure is higher that in the veins in the face or neck. The sss of the dura mater is a rather large channel of venous blood situated right under the calvaria, at the highest position in the body, if the body stands upright. As an additional significant feature, its walls are rigid, non-collapsible. Therefore, a negative blood pressure in this channel will exert a sucking effect on the arachnoid granulations and so facilitate the flow of CSF into the blood. If the rate of renewal of the CSF is of any importance for the clean up and maintenance of the brain, the upright position and gait is important from both the physiological and evolutionary point of view.

When we study the distribution of these granulations throughout the venous sinuses of the dura mater, we immediately notice that the largest of these granulations and the greatest number of them are present in the wall of the parietal segment of the sss and in the venous lacunae laterales adjacent to this segment,- the area which vibrates most vigorously during vocalization. The way, in which this vibration can influence the flow of the CSF through the granulations into the blood, has not been quite clear. It was believed that the granulations just were some kind of bolts which fixed the arachnoid membrane to the dura mater and to the skull. When it became clear that it is through them that the CSF gets into the blood, the exact mechanism still eluded the researchers. Human arachnoid granulations are unique. Its granulations serve in a very simple mechanistic way as funnels for the flow of the CSF.

The cells in the caps of the arachnoid granulations represent some kind of sieve through which the CSF flows in one direction only, from the subarachnoid space into the sinuses, because the cells lay over each other, similar to roof tiles or the leaflets of a rose bud. If the pressure of the CSF is higher than that of the blood in the sinus, the flow is possible. If the pressures were reversed, the layers of cells in the caps start functioning as microscopic valves and the dangerous backflow from the blood into the subarachnoid space is prevented.

 

 

Fig 14

The "rafters" of the skull vault. Relationship of arachnoid bulbs to intersecting fibrous bands in the walls of the superior sagittal sinus and in the floor of the lateral lacunae. As the fibres of the occipital (O) and frontal (F) radiations of the falx intersect, they surround the arachnoid bulbs from various sides. The picture is simplified, there are many branching fibres, interconnected in more complicated ways, and the bulbs are frequently situated obliquely. The arachnoid membrane lines the entire framework on the underside (a). As the fibres vibrate during vocalization, they massage the bulbs and the flow of the CSF through them is accelerated. The direction of the flow of the CSF is indicated with arrows. The part of the dura mater which lines the wall of the sinus or lateral lacuna is not depicted. (Ill.: Jindrak)

The concept of a sieve is favourable for the Jindrak postulate. If we want to force particulate material through a sieve, we have to shake - or vibrate - the gadget, otherwise the passage of material through the sieve will stop. When we begin to examine the above described process at microscopic level, we find that even the flow of a liquid through a sieve with minute, microscopic openings will be enormously facilitated by vibrations. It has to do with the internal friction of the molecules in a liquid and with so-called surface tension. As the granulations vibrate, the flow of the CSF becomes faster.

There seem to be additional mechanisms associated with vibration of the skull and dura mater which might enhance the flow of the CSF into the blood: The neck of each granulation passes through the dura mater. As the dura mater vibrates, its attachment onto the neck of the arachnoid granulation may exert a milking effect on it. Such an effect is difficult to prove. however. Nevertheless, when we realize that many smaller granulations, the arachnoid bulbs, pass through the holes in the grid formed by the radiating fibres, as this network starts vibrating, the grid becomes transformed into a system of vibrating strings, which begin to compress and release the necks of the bulbs. We find this in the wall of the superior sagittal sinus with the crossing fibres of the anterior and posterior radiation.

There is another effect: That of the vibrations of the parietal bone. Here we have structural, anatomic evidence. Some of the arachnoid granulations are so large, that they impinge upon the opposite wall of the sinus which is lining the intracranial surface of the bone. At the site of this contact, the fibrous, dural, part of the sinus wall is markedly thinned out, and the bone is hollowed out, forming a small pit, called foveola granularis. Multiple such foveolae can be seen on the inner aspect of the parietal bones close to the sagittal suture. Each foveola contains the tip of an arachnoid granulation which protrudes into it. As the bone vibrates, the bony foveola may exert a sucking, pumping effect on the arachnoid granulation.

The distribution, shape , function and interrelations of all these structures remain incomprehensible without the existence of significant, frequent, and vigorous vibrations of the skull as produced by vocalization.

On the other hand, many structural peculiarities of the arachnoid villi and granulations begin to make sense the moment we accept the principle of the effect of vibrations on the CSF.

The true arachnoid granulation is a complex of arachnoid bulbs, usually several tens of them. The bulbs have an inner collagenous core which the villus does not have. Psammona bodies are frequently found in them, and occasionally one can even find a tiny bone in the core or the surface of a bulb. Near the tip of the bulb, the arachnoid and the dura mater form a very cellular contact. A true Pacchionian granulation is, therefore, a complex of multiple arachnoid bulbs completely surrounded and penetrated by multidirectional scaffolding of collagenous bands which are also derived from the dura mater,- from the fibres which are a continuation of the posterior and anterior radiation of the fibres in the falx.

The human arachnoid granulations are much more complicated than similar structures found so far in animals; they are at the top of the evolutionary ladder of this tiny organ. Second, they develop gradually after birth. Newborn babies have very simple arachnoid villi protruding into the wall of the sagittal sinus. The first granulations visible by unaided eye appear around the age of 2 years. With advancing age, they become larger and more complex. It is not known wether they diminish or degenerate in old age.

Dr. Jindrak is convinced that these tiny pumps are extremely important for speeding up the circulation of the CSF and by that the elution of undesirable substances from the brain. To have a better functioning brain, we have to have more of these pumps, and we have to make them work by vocalizing - or by Vibroacoustic stimulation.

Because the pumps develop during infancy and childhood and most likely, in response to frequent vocalization,- if we do not vocalize enough as a child or youngster, we may be stuck with an inefficient biological computer for the rest of our lives. One way of counteracting this will be to make use of the possibilities which exist in Vibroacoustic therapy.