The choroid plexus is a specially formed arterio-venous-vessel-network on an epithelial basis, in the brain ventricles, that producs and reabsorbs and cleans cerebrospinal fluid and forms part of the blood-brain-barrier.
The choroid plexus can be found:
From lateal end of the 4th ventricle a part of the plexus produdes on both sides from the Apertura lateralis (Foramen Luschkae).
The plexus of the lateral ventricles is connected to that of the 3rd ventricle through the Foramen interventriculare (Monro).
(Source of picture: Anatomist90)
