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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.
To protect and cushion the brain and the spinal cord against possible injury. 2. To deliver nutrients from the blood to the Central Nervous System and removes. wastes. The procedure used to obtain cerebrospinal fluid is referred to as Lumbar Puncture or. a Spinal Tap.