Which of the following statements is correct?
A. The inner layer of the dura mater is attached to the arachnoid.
B. The pia mater is a delicate membrane loosely attached to the dura mater.
C. Extensions of the arachnoid anchor the spinal cord to the dura mater.
D. Arachnoid trabeculae connect the arachnoid to the brain and spinal cord.
E. Both A and D are correct statements.
ANS: A
Rationale: The three meningeal layers are the (1) dura mater, (2) arachnoid, and (3) pia mater. The outer layer of the dura mater is attached to the skull, with the inner layer loosely attached to the delicate arachnoid. The innermost layer, the pia mater, is tightly attached to the surface of the brain and spinal cord. Arachnoid trabeculae connect the arachnoid and pia mater.
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