CSF

Cerebrospinal fluid circulation
Choroid plexus Creates CSF in lateral ventricles. It enters third ventricle through interventricular foramen of Monro.
From 3rd ventricle, it enters 4th ventricle via aqueduct of Sylvius.
From 4th ventricle it enters subarachnoid space via foramen of Magendie (Medially ) and 2 foramen of Luschka (Laterally).
Thereon, it circulates through entire brain and spinal cord to be reabsored by Arachnoid villi.