Which of the following statements about the meninges is false?

• A. The meninges consist of three layers: dura mater, arachnoid mater, and pia mater.
• B. The pia mater is the outermost layer of the meninges.
• C. Cerebrospinal fluid circulates in the subarachnoid space between the arachnoid mater and pia mater.
• D. The meninges protect the brain and spinal cord.

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by understanding the meninges, which are protective layers surrounding the brain and spinal cord. The meninges consist of three layers: dura mater (outermost), arachnoid mater (middle), and pia mater (innermost).
2. Step 2: Review the statement 'The pia mater is the outermost layer of the meninges.' This is incorrect because the pia mater is actually the innermost layer, closely adhering to the surface of the brain and spinal cord.
3. Step 3: Examine the other statements provided: 'Cerebrospinal fluid circulates in the subarachnoid space between the arachnoid mater and pia mater' and 'The meninges protect the brain and spinal cord.' Both of these statements are true based on anatomical and physiological knowledge.
4. Step 4: Compare the false statement ('The pia mater is the outermost layer') with the true statements to confirm that it contradicts the correct anatomical arrangement of the meninges.
5. Step 5: Conclude that the false statement is 'The pia mater is the outermost layer of the meninges,' as it misrepresents the position of the pia mater within the meninges.