GENERAL HISTOLOGY

Detailed explanation-1: -Three layers of membranes known as meninges protect the brain and spinal cord. The delicate inner layer is the pia mater. The middle layer is the arachnoid, a web-like structure filled with fluid that cushions the brain. The tough outer layer is called the dura mater.

Detailed explanation-2: -The pia mater is the innermost layer of meninges. This thin, delicate membrane is tightly bound to the surface of the brain and spinal cord and cannot be dissected away without damaging the surface.

Detailed explanation-3: -The pia mater is composed of two layers. The epipial layer is more superficial and contiguous with the arachnoid trabeculae, whereas the inner layer, the intima pia, is adherent to the adjacent neural tissue, following its contours. The pia dips between cerebral gyri and cerebellar folia.

Detailed explanation-4: -The dura mater is composed of two layers: the periosteal/endosteal layer and the meningeal layer. The dural venous sinuses are between these two layers. The dura folds to form septa that create the falx cerebri, tentorium cerebelli, falx cerebelli, and diaphragma sellae.

Detailed explanation-5: -There are two subdivisions of arachnoid mater surrounding the subarachnoid space, the dorsal layer and the ventral layer.