Question

with a subdural hematoma resulting from a blow to the head, where has the blood accumulated?
multiple choice
between the arachnoid mater and the pia mater
between the dura mater and the arachnoid mater
between the dura mater and the skull
between the pia mater and the brain

Explanation:

To solve this, we recall the layers of the meninges (protective coverings of the brain). The dura mater is the outermost, then arachnoid mater, then pia mater. A subdural hematoma means "sub" (below) the dura mater. So blood accumulates between dura mater and arachnoid mater. Let's analyze each option:

• "Between the arachnoid mater and the pia mater" is a subarachnoid space, not subdural.
• "Between the dura mater and the arachnoid mater" matches the definition of subdural (below dura, above arachnoid).
• "Between the dura mater and the skull" is an epidural space (above dura), so epidural hematoma, not subdural.
• "Between the pia mater and the brain" is not a typical meningeal space for hematoma here.

Answer:

B. Between the dura mater and the arachnoid mater