Where does CSF circulate?

Where does CSF circulate?

• A. The subarachnoid space
• B. The spinal canal
• C. The cerebral cortex
• D. The ventricles

Answer: (D)

CSF circulation begins where it’s produced: in the choroid plexus within the ventricles. From there, CSF flows through the ventricular system—lateral ventricles to the third ventricle, through the cerebral aqueduct to the fourth ventricle—and then exits into the subarachnoid space surrounding the brain and spinal cord to circulate, before being reabsorbed into the venous system. Because production and the initial flow occur in the ventricles, they are the primary site of CSF circulation. The subarachnoid space and spinal canal contain CSF as it travels, but they are downstream in the circulation pathway. The cerebral cortex is not a CSF-space.

CSF circulation begins where it’s produced: in the choroid plexus within the ventricles. From there, CSF flows through the ventricular system—lateral ventricles to the third ventricle, through the cerebral aqueduct to the fourth ventricle—and then exits into the subarachnoid space surrounding the brain and spinal cord to circulate, before being reabsorbed into the venous system. Because production and the initial flow occur in the ventricles, they are the primary site of CSF circulation. The subarachnoid space and spinal canal contain CSF as it travels, but they are downstream in the circulation pathway. The cerebral cortex is not a CSF-space.