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inner, delicate tissue rich with tiny blood vessels; clings tightly to the surface of the brain, following every condition
middle layer that forms a loose covering that never dips into the cerebral sulci
Cerebrospinal Fluid (CSF)
- Forms a liquid cushion in and around the brain and spinal cord, giving buoyancy to the CNS
- Reduces weight of brain by 97%, preventing pressure under its own weight
- protects the CNS from blows and other trauma helps nourish the brain