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MCAT Question A Day - 3/19/14 - Answer!

Cerebrospinal fluid (CSF) is produced by special capillary networks in the brain called choroid plexuses. CSF circulates through the hollow regions of the brain and spinal cord and around the central nervous system, within its protective coverings. Areas that are part of the CSF pathway include the

A.  ventricles, spinal canal, and cranial nerves.
B.  ventricles, spinal canal, and meninges.
C.  ventricles, spinal canal, and spinal nerves.
D.  meninges, spinal canal, and cranial nerves.

The correct answer is (B). Basic knowledge of central nervous system (CNS) anatomy and the protective coverings of the CNS are required. The organs of the CNS (brain and spinal cord) have hollow regions (ventricles and spinal canal, respectively). The CNS also has three layers of protective covering (the meninges). The question states that cerebrospinal fluid circulates in these areas. Thus, choice (B) is the correct answer. The spinal nerves and cranial nerves are not considered part of the CNS.

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