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 space between the spinal dura mater and the periosteum of the vertebral column is called the epidural space. It is filled with loose connective and adipose tissues, and traversed by the anterior and posterior internal vertebral venous plexuses.

Detailed explanation-3: -The outermost layer of the meninges is called the dura mater because it is thick and tough.