Biology 30 – Nervous System Practice Exam

Which membrane is the delicate innermost layer enveloping the brain and spinal cord?

Cerebrospinal fluid Pia mater Arachnoid mater Forebrain

Correct Answer:

Pia mater

Explanation:

Protective coverings of the brain and spinal cord are organized in layers called meninges. The delicate innermost membrane is the pia mater, which lies directly on the brain and spinal cord, following every curve and groove of the tissue. This close contact allows it to provide a thin, highly vascular layer that supports the surface with blood vessels. The middle membrane is the arachnoid mater, which has a web-like appearance, and the outermost layer is the tough dura mater. Cerebrospinal fluid is the circulating fluid found in spaces such as the subarachnoid space, not a membrane, and the forebrain is a brain region, not a covering.

Access more questions from this quiz

Continue to Biology 30 – Nervous System Practice Exam for more practice questions and the full quiz experience.

Access More Questions