ANATOMY

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: -Three layers called the meninges encase the brain and spinal cord. From superficial to deep, these layers are the dura mater, arachnoid mater, and pia mater.

Detailed explanation-3: -Explanation: The correct order of the spinal meninges from superficial to deep (outside to inside) is dura mater, arachnoid mater, and pia mater.

Detailed explanation-4: -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.

Detailed explanation-5: -Dura mater, also known as the pachymeninx. Arachnoid mater. Pia mater.