It consists of cavities lined with ependymal cells, interconnected with narrow channels that contain cerebrospinal fluid (CSF).
Theres is a vascular process of the pia mater in the ventricles containing capillaries of the choroids artery/arteria choroidea called choroids plexus/plex choroideus. The lateral ventricles/ ventriculus lateralis are located in each hemisphere and subdivided in body, anterior horn, posterior horn and inferior horn. Each lateral ventricle is connected to the third ventricle/ ventriculus tertius by foramen interventricularis (foramen Monro). The third ventricle is located in the midline and is connected to fourth ventricle/ventriculus quartus by the cerebral aqueduct/aqueductus cerebri. The fourth ventricle/ventriculus quartus is located between the brain stem and cerebellum.