Which layer of the meninges is the toughest and most external?

The dura mater is indeed the toughest and most external layer of the meninges, which are protective membranes that cover the brain and spinal cord. It serves as a crucial barrier against physical impacts and infection, thereby safeguarding the delicate neural tissues underneath it. The dura mater is composed of dense connective tissue, making it the strongest layer among the three meningeal layers: the dura mater, arachnoid mater, and pia mater.

In addition to providing physical protection, the dura mater also plays a key role in the overall structure and support of the central nervous system, as it forms dural sinuses that help in the drainage of blood from the brain. Its outer layer is tightly adhered to the inner surface of the skull, contributing to the stability of the brain within the cranial cavity. This toughness and encompassing nature make the dura mater essential for maintaining the integrity of the central nervous system.