MEDICAL PHYSIOLOGY

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 term “pia mater” means “tender matter.” It is composed of delicate connective tissue and has many tiny blood vessels. The pia mater is the only layer that clings tightly to the brain and follows all of its convolutions. Cerebral arteries and veins travel in the subarachnoid space, completely enveloped by pia mater.

Detailed explanation-3: -The deepest layer of the meninges, the pia mater, is composed of two layers and, unlike the arachnoid, follows the contours of the sulci and gyri. The outer layer of the pia, referred to as the epipial layer, contains collagen fibers; the inner layer, or the intima pia, contains elastic and reticular fibers.