What are the three meanings of the brain? Where are they present

Explanation

The brain is located in the cranial cavity and is covered by three cranial meninges.
(i) The outer thick layer is Duramater which lines the inner surface of the cranial cavity.
(ii) The median thin layer is Arachnoid mater which is separated from the duramater by a narrow subdural space.
(iii) The innermost layer is Piamater which is closely adhered to the brain but separated from the arachnoid mater by the subarachnoid space.