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The choroid plexus is the area on the ventricles of the brain where cerebrospinal fluid (CSF) is produced.
Choroid plexus is present in the superior part of the inferior horn of the lateral ventricles. It follows up along this boundary, continuous with the inferior of the body of the lateral ventricles. It passes into the interventricular foramen, and is present at the top of the third ventricle.
There is also choroid plexus on the fourth ventricle, on the section closest to the bottom half of the cerebellum.
Structure of the choroid plexus
The choroid plexus consists of many capillaries, separated from the subarachnoid space by pia mater and choroid epithelial cells. Liquid filters through these cells from blood to become CSF. There is also much active transport of substances into, and out of, of the CSF as it's made.
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