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Purpose. Cerebrospinal fluid is a clear liquid produced within spaces in the brain called ventricles. Like saliva it is a filtrate of blood. It is also found inside the subarachnoid space of the meninges which surrounds both the brain and the spinal chord.erebrospinal fluid is a clear liquid produced within spaces in the brain called ventricles. Like saliva it is a filtrate of blood. It is also found inside the subarachnoid space of the meninges which surrounds both the brain and the spinal chord.
Choroid plexus Function. The modified ependymal cells of the vascular membrane produce 500 ml of cerebrospinal fluid per day. Interestingly, the spinal fluid is continuously recycled to filter out the metabolites, foreign particles and other toxic products.