What is a meninges?

Meninnges (singular Meninx) are three connective tissue layers that lie between the brain and skull, and the spinal cord and

vertebrae. These membranes envelop the organs of the central nervous system and provide protection, support and nutrition.

The meninges are composed of a fibrous outer layer called the Dura Mater, a middle arachnoid layer called the Arachnoid Mater and an inner most delicate vascular pia layer called Pia Mater. The dura mater is a tough fibrous membrane that lines the cranial cavity and spinal canal, the arachnoid mater is a delicate web-like membrane that envelops the brain and spinal cord, and the pia mater is a thin membrane that closely follows the contours of the brain and spinal cord and serves as a barrier between the neural tissues and underlying blood vessels.

The meninges function as a protective covering for the brain and spinal cord, providing both physical support and structural stability. They also protect the brain and spinal cord from mechanical trauma, thermal fluctuations and chemical insults, and aid in maintaining the appropriate fluid balance and pressure within the central nervous system. Additionally, the meninges aid in the circulation of cerebrospinal fluid, supplying vital nutrients and removing metabolic waste products.