Which of the following correctly describes the circulation of CSF?
A. Choroid plexus, subarachnoid space, lateral ventricles, arachnoid villi
B. Arachnoid villi, subarachnoid space, lateral ventricles, choroid plexus
C. Choroid plexus, lateral ventricles, subarachnoid space, arachnoid villi
D. Arachnoid villi, lateral ventricles, arachnoid villi, subarachnoid space
ANS: C
Rationale: The choroid plexus of the ventricles secret CSF. From the lateral ventricles, CSF flows into the third ventricle via the interventricular foramina and from the third ventricle into the fourth via the cerebral aqueduct. After exiting the fourth ventricle through the lateral and medial foramina, CSF moves into the subarachnoid space. Ultimately, CSF is absorbed through the arachnoid villi into the venous sinuses.
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