Choroid Plexus

**Definition:** A villous structure of tangled masses of BLOOD VESSELS contained within the third, lateral, and fourth ventricles of the BRAIN. It regulates part of the production and composition of CEREBROSPINAL FLUID.

**Tree numbers:** - A08.186.211.140.298

**Synonyms:** - Chorioid Plexus - Plexus Choroideus