Answer:
It provides a fluid buffer which acts as a shock absorber that absorbs any kind of mechanical injury.
Explaination:
The cerebrospinal fluid is a clear watery protein- free substance that surrounds and protects the brain and spinal cord and also serves as nutrient delivery and waste removal system for the brain.
Protection:
It basically provides lubrication between bones and spinal cord & between the skull and brain. When the victim suffers from a head injury, the fluid acts as a buffer that absorbs or dulls the force.