The importance of arachnoid granulations for the drainage of CSF is controversial.
2.
The arachnoid granulations act as one-way valves.
3.
On the inner surface of cranial bones, small pits called "'granular fovea "'are produced by arachnoid granulations.
4.
This then causes a cascade of cranial venous hypertension, which decreases CSF resorption from the arachnoid granulations, leading to intracranial hypertension and papilledema.
5.
In patients with bobble-head doll syndrome, an impairment exists in the ability to reabsorb CSF by the arachnoid granulations leading to an accumulation.
6.
The majority is produced by the choroid plexus in the brain and circulates from there to other areas, before being reabsorbed into the circulation ( predominantly by the arachnoid granulations ).
7.
Since the subarachnoid space around the brain and spinal cord can contain only 135 to 150 ml, large amounts are drained primarily into the blood through arachnoid granulations in the superior sagittal sinus.
8.
"Pacchioni's granulations " ( or pacchionian bodies ), where the arachnoid layer protrudes through the dura, are named for him ( although they are now generally known as arachnoid granulations ).
9.
It has been proposed that a positive biofeedback loop may exist, where raised ICP ( intracranial pressure ) causes venous narrowing in the transverse sinuses, resulting in venous hypertension ( raised venous pressure ), decreased CSF resorption via arachnoid granulation and further rise in ICP.
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