Which is the innermost meninges layer that directly covers the brain surface?

Which is the innermost meninges layer that directly covers the brain surface?

• A. Subarachnoid space
• B. Dura mater
• C. Arachnoid mater
• D. Pia mater

Answer: (D)

Pia mater is the innermost meningeal layer and directly adheres to the brain’s surface, following every groove and contour. It is a delicate, highly vascular membrane that accompanies the brain’s vessels as they enter the tissue. The space beneath it, the subarachnoid space, contains cerebrospinal fluid and blood vessels. Above it sits the arachnoid mater as a separate, web-like layer, and outside that is the tough dura mater. Because the pia mater directly covers the brain tissue, it is the innermost membrane that contacts the brain.

Pia mater is the innermost meningeal layer and directly adheres to the brain’s surface, following every groove and contour. It is a delicate, highly vascular membrane that accompanies the brain’s vessels as they enter the tissue. The space beneath it, the subarachnoid space, contains cerebrospinal fluid and blood vessels. Above it sits the arachnoid mater as a separate, web-like layer, and outside that is the tough dura mater. Because the pia mater directly covers the brain tissue, it is the innermost membrane that contacts the brain.