• The human brain is protected by the skull.

• Inside the skull, there are cranial meninges that cover the brain.

• The cranial meninges is made up of three layers, namely – Duramater (outer layer), Arachnoid (middle layer) and Pia mater (inner layer which is in contact with the brain).

• Duramater is thick, tough, fibrous membrane

• Arachnoid is a membrane with spider-like structure.

• Piamater is a very thin, delicate and vascular membrane.

• The space between duramater and arachnoid is called subdural space.

• The space between arachnoid and piamater is called subarachnoid space. It is filled cerebrospinal fluid which acts as cushion for CNS from shock.