Write a short note on meninges.

Explanation

Brain is covered by three cranial meninges. The outer thick layer is Duramater which lines the inner surface of the cranial cavity, the median thin layer is Arachnoid mater which is separated from the duramater by a narrow subdural space. The innermost layer is Piamater which is closely adhered to the brain but separated from the arachnoid mater by the subarachnoid space.