Which membrane is a fine, weblike layer beneath the outer dura mater?

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Multiple Choice

Which membrane is a fine, weblike layer beneath the outer dura mater?

Explanation:
Between the dura mater and the brain lies a delicate, spider-web-like membrane called the arachnoid mater. Its fine, weblike nature comes from the interconnected trabeculae spanning the subarachnoid space, which is also where cerebrospinal fluid circulates and major vessels run. This placement and appearance set it apart from the dura mater, the tough outer covering, and from the pia mater, the thin membrane that closely follows the brain’s contours. The parietal peritoneum is not part of the cranial coverings.

Between the dura mater and the brain lies a delicate, spider-web-like membrane called the arachnoid mater. Its fine, weblike nature comes from the interconnected trabeculae spanning the subarachnoid space, which is also where cerebrospinal fluid circulates and major vessels run. This placement and appearance set it apart from the dura mater, the tough outer covering, and from the pia mater, the thin membrane that closely follows the brain’s contours. The parietal peritoneum is not part of the cranial coverings.

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