Fluid compartment of CNS
Main fluid components – Cerebrospinal Fluid & Cerebral blood flow
• Lubrication by CSF
• Nutrition by cerebral blood flow
→ Normal Volume = 150 mL; Normal CSF pressure = 70 -180 mm H2O.
→ Rate of CSF production = 550 mL/day; Recycling rate = 3.7 times/day
→ Site of production = CHOROID PLEXUS; Absorption site = ARACHNOID VILLI
→ Regulation occurs at level of absorption.