The tough outer layer of the meninges is which?

The tough outer layer of the meninges is which?

• A. Dura Mater
• B. Arachnoid
• C. Pia Mater
• D. Subdural Space

Answer: (A)

The outermost protective covering of the brain and spinal cord is the dura mater. It’s a thick, fibrous membrane that provides most of the meninges’ strength and helps anchor the brain to the skull, forming folds that partition parts of the brain and housing the dural venous sinuses that drain blood from the brain. Beneath it lies the arachnoid, a looser, web-like middle layer, and then the pia mater, a delicate inner layer that closely adheres to the brain’s surface. The space beneath the dura and arachnoid is the subdural space, a potential space that can fill with blood in injury.

The outermost protective covering of the brain and spinal cord is the dura mater. It’s a thick, fibrous membrane that provides most of the meninges’ strength and helps anchor the brain to the skull, forming folds that partition parts of the brain and housing the dural venous sinuses that drain blood from the brain. Beneath it lies the arachnoid, a looser, web-like middle layer, and then the pia mater, a delicate inner layer that closely adheres to the brain’s surface. The space beneath the dura and arachnoid is the subdural space, a potential space that can fill with blood in injury.