- 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.
Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
- A highly vascular portion of the pia mater that projects into the ventricles of the brain and is thought to secrete the cerebrospinal fluid.
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
See also Understanding Medical Terminology.