A new vision of how the cranial sea flows through the central nervous system and ventricles.
To understand how the cranial sea flows you have to understand some fundamental principles.
The brain is an aqueous environment it has the composition of soft jelly. It is 90% water and the cranial sea is 99% water. The glial cells (brain cells) float in this sea like sea anemones and seaweed. They have long tentacles to join to each other rather than connecting directly. This means that the cranial sea can easily flow through these glial cells like a river or tide.
Also the cranial sea that flows around the glial cells and the cranial sea in the ventricles have exactly the same constitution they are 99% water and 1% glucose, oxygen, and salt.
These two fluids are not separate the membrane lining the ventricles has very loose connections and the cranial sea easily flows through this. These two fluids are essentially one cranial sea.
To make a distinction there is cranial sea that is full of oxygen and glucose. And there is cranial lymph where all the oxygen and glucose have been used by the glial cells. This process produces carbon dioxide.
New cranial sea is continually being made from the capillaries within the brain and choroid plexus.
I went into this in-depth in the last picture story you can find that on the button below
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It is also important to understand that there is a large off flow of cranial sea that can be thought of as cranial lymph. I show how this cranial lymph is produced and how it leaves the central nervous system below.
The only way for cranial sea to leave the brain or spine other than by the venous blood is to leave through the dura and the nerves which are the outer face of the central nervous system. This means that the central body of cranial lymph shown in the picture has to leave via the dura and nerves. For myself I think the cranial sea is mainly flowing out through the nerves as they are open vessels and there is nothing there to stop the cranial sea flowing out. Even though the cranial sea can flow out through the dura which is the membrane around the whole central nervous system I think it flows through this quite slowly as it is a thick membrane.
The cranial sea is 99% water and the fundamental principle of water in our body is that it can flow through any cell or membrane anywhere in the body via osmosis.
The cerebrum is 85% of the volume of the whole central nervous system. As the cerebrum is above the tentorium and all of the cranial nerves are below the tentorium that means the cranial sea/lymph has to flow down through the tentorium to be able to leave via these nerves. There is a hole in the tentorium where the brainstem rises up through it. The cranial sea can flow down through this hole by going around the brainstem, also by flowing down through the glial cells in the brainstem or through the cerebral aqueduct between the third and fourth ventricles. It is good to remember that as with the cerebrum the brainstem is more sea than solid structure. It is 90% water with the composition of soft jelly. The cranial sea easily migrates around and between the glial cells
This picture shows the cranial sea migrating through the glial cells towards the brainstem to leave the cerebrum. A lot of this fluid flows into the lateral ventricles which are wrapped around the thalamus which is the top of the brainstem.
This picture shows the lateral ventricles wrapped around the thalamus and the third ventricle centre inside the thalamus the cranial sea flows through the thalamus down the brainstem and through the whole in the tentorium
The Choroid plexus shown in red is part of the thalamus. This is the back of the thalamus and the choroid plexus will travel forwards and out along the the bottom sides of the thalamus. The choroid plexus is where the ventricles join to the thalamus so this will also be showing the back of the two lateral ventricle.
The ventricles receive the cranial lymph that has been flowing through the glial cells of the cerebrum towards the brainstem. All of the oxygen and glucose in this cranial lymph have been used by the glial cells and has produced carbon dioxide. This flows into the ventricles and to the choroid plexus. The choroid plexus filters out the CO2 and produces new cranial sea with oxygen, glucose, and salt which flow directly into the body of the thalamus as food and breath.
The textbooks say that the choroid plexus filters out the carbon dioxide from the cranial lymph as well as creating new cranial sea. This is the only way that the venous blood in the choroid plexus can be utilised. From what I can see the blood supply to the choroid plexus is about a quarter of the blood supply to the brain. So the venous blood travelling back from the choroid plexus is a quarter of the brains detoxification ability.
Some of this new cranial fluid also flows through the interventricular foramen into the third ventricle in the centre of the thalamus. The third ventricle is shown in light blue in the centre of the thalamus in the picture above.
Choroid plexus is part of the thalamus and as the flow of cranial sea is inward the new cranial sea just flows into the thalamus and becomes food and breath for the glial cells there. It is good to remember that the glial cells are joined together by tentacles and there's plenty of room for the cranial sea to flow through them. This is exactly the same as everywhere else in the body the oxygen and nutrients come out of the blood they are used straightaway locally by the cells there, this produces carbon dioxide which returns via the venous blood and lymph. Everything happens locally and instantly.
This next picture is inside the third ventricle
Cranial sea full of oxygen, glucose, and salt is flowing into the third ventricle via the interventricular foramen.
Also the whole top of the third ventricle is made of choroid plexus this is taking away carbon dioxide and is producing new cranial sea. This is food and breath for the third ventricle and thalamus. The different colours are the nuclei of the hypothalamus these receive these nutriment's and can also quickly off load carbon dioxide which is taken away by the choroid plexus.
It also flows down into the pineal gland and at the very bottom of the and also into the optic nerve in the beak itself. The cranial sea also feeds the pineal gland at the back of the third ventricle. The cranial sea can flow down the full length of the optic nerve as shown in the first picture story of the cranial sea –
From here the cranial sea is flowing down through the glial cells of the thalamus into the glial cells brainstem and pons. It is also flowing from the third ventricle down the cerebral aqueduct into the fourth ventricle. The fourth ventricle is also full of choroid plexus. It is also where the cranial sea flows out from the cerebellum. There are no cranial nerves from the cerebellum so the cranial lymph is travelling towards the exit which is the cranial nerves leaving the pons.
The choroid plexus filters out the carbon dioxide from the sea and produces new cranial sea that is blowing forwards with the tide into the pons. All of the nerve nuclei for the cranial nerve are nested up against the posterior face of the pond's and the anterior phase of the fourth ventricle. This new cranial sea flows forwards into the pons and feeds these nerve nuclei.
From here the cranial sea flows down the myelinating capillaries as food for the myelinating glial cells and axon of the nerve. Also the nerves will receive cranial lymph from this area and from around the outside of the pons and transported it out of the central nervous system and then finally out through fine membrane around the nerves and into the lymph of the body. Then completing the journey back to the heart.
This is looking from behind the diamond-shaped is the join to the cerebellum behind. The cranial sea from the cerebellum is flowing into this ventricle the choroid plexus filters out the CO2 and produces new cranial sea which flows forwards into the pons and feeding cranial nerve nuclei with oxygen glucose and salt.
From here the cranial sea flows down through the spine. It flows around the spine, it flows down through the glial cells inside the spine and it flows down through the fifth ventricle which travels down the centre of the spine.
In this picture I show the cranial sea around the spinal cord much wider than it actually is this is so that I can show the nerves. The cranial sea from around the spinal cord, in the spinal cord and from the fifth ventricle down the middle of the spinal can all flow out through the nerves. All the cranial sea that cannot be taken back by the venous blood flows out through the nerves or to a certain extent through the dura which is the membrane around all of this.
The cranial sea is 99% water. This makes it the heaviest fluid in the body. The cranial sea in the central nervous system from the top of the head to the bottom of the sacrum is an open channel of water. Between the glial cells, within the ventricles, and around the brain and spinal cord is an open arm broken flow of water (cranial sea). At the top of the cranial sea in the cerebrum there is no pressure but at the bottom in the sacrum there is pressure and weight of the vertical column of about 1 m of water. This is a lot of pressure. A flushing toilet has about half a metre of pressure and you can see how fast the water flushes down. It's a very similar thing the header tank is like the brain and the tube coming down to the toiler is like the spine. This pressure helps the cranial sea flow of down through the nerves. The bottom one third of the spine is just nerves (the horse's tail). This makes a surface area and all of the cranial sea that would be lymph (the fluid that does not go back in the venous blood) flows into these nerves. And as these nerves travel out through the dura so does the cranial sea.
For the previous article where I show the three filters that make the cranial sea and also an in depth look at the myelinating glial cells that produce capillaries to take the cranial sea through the nerves and to produce more cranial sea. Please click on the buttonThe three filters that create the cranial sea and how it flows through the myelinating glial capillaries
In this next picture article I show the underlying principles of the cranial sea and how it is literally impossible for it to work in the way that is shown in the anatomy books and taught in schools. Please share my work around.Is the traditional image of the cranial fluid wrong?
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I hope you have enjoyed my picture story. If you wish to ask any questions or share anything you can from this email –