Cerebrospinal Fluid (CSF) Circulation

The spinal fluid circulates freely within the normal central nervous system. It is secreted by the choroid plexus in the lateral ventricles of the brain. From there it flows into the third ventricle, which is drained by the aqueduct into the fourth ventricle. From the fourth ventricle, the CSF exits to circulate around the brainstem, spinal cord, skull base, cerebellum, cerebrum, and other spinal fluid-containing spaces. It is continually secreted and absorbed, and replaced every six to eight hours.

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