Csf Production And Absorption A Anatomy 1 Ventricular System

The foramen of Munro allows CSF to travel from the lateral ventricles to the third ventricle and the aqueduct of Sylvins connects the third and fourth ventricles. Much of CSF is produced by the choroid plexus of the ventricular system and leaves through the openings in the fourth ventricle (foramina of Luschka and Magendie) into the subarachnoid space that surrounds the brain and spinal cord. It then travels around the convexities up to the sagittal sinus.

2. Choroid Plexus

The choroid plexus is the source of 60% of CSF production: It is composed of villi, which secrete CSF. Hypersecretion of CSF is virtually never a source of hydrocephalus. It should be noted that 40% of CSF is probably derived from fluid from brain parenchyma.

3. Arachnoid Villi

Arachnoid villi are specialized clusters of arachnoid cells that appear to allow CSF absorption into the sinuses and perhaps along nerve roots. In dogs and some other animals, there are no villi: CSF is absorbed along nerve root sheaths. In humans, arachnoid villi seem to absorb about 60% of CSF; the rest may be absorbed by nerve root sheaths as well.

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