The choroid plexus (CP) (from Greek khorion “membrane enclosing the fetus, afterbirth”; plexus: Mod.L., lit. “braid, network”) is a plexus in the ventricles of the brain where cerebrospinal fluid (CSF) is produced.
The choroid plexus is a venous plexus contained within the four ventricles of the brain, hollow structures inside the brain filled with CSF.
The choroid plexus consists of modified ependymal cells.
The choroid plexus must produce about 500 milliliters of CSF daily (or 21 mL per hour).
Cerebrospinal fluid (CSF) pathway studies have revealed that the CSF secreted from the choroid plexus of the ventricles after egressing from the fourth ventricle reaches the basal suprasellar cistern and ultimately the sylvian cisterns.
The structure, continuous with that of the lateral and third ventricles, and which is also present in the fourth ventricle.