The middle layer of the meninges is which?

The middle layer of the meninges is which?

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

Answer: (D)

Three protective membranes cover the brain and spinal cord in order: a tough outer layer, a middle layer with a web-like appearance, and a delicate inner layer. The middle layer is the arachnoid mater. It sits between the tough outer dura mater and the delicate pia mater, and its name reflects its spiderweb-like structure. The arachnoid forms a loose, webby barrier and creates the subarachnoid space, which is filled with cerebrospinal fluid and houses blood vessels. The space between the dura and arachnoid is the subdural space, which is only a potential space that can form under certain conditions. The innermost layer, the pia mater, closely adheres to the brain’s surface.

Three protective membranes cover the brain and spinal cord in order: a tough outer layer, a middle layer with a web-like appearance, and a delicate inner layer. The middle layer is the arachnoid mater. It sits between the tough outer dura mater and the delicate pia mater, and its name reflects its spiderweb-like structure. The arachnoid forms a loose, webby barrier and creates the subarachnoid space, which is filled with cerebrospinal fluid and houses blood vessels. The space between the dura and arachnoid is the subdural space, which is only a potential space that can form under certain conditions. The innermost layer, the pia mater, closely adheres to the brain’s surface.