- Cerebrospinal fluid (CSF) is produced by the choroid plexuses of the lateral, third and fourth ventricles
- Passes from the lateral ventricles to the third ventricle through the two interventricular foramina (foramen of Monro)
- passes from the third ventricle to the fourth ventricle via the Sylvian aqueduct
- Escapes into the cerebellar subarachnoid space through the:
- Foramen of Magendie (Medial)
- Foramen of Lushka (Lateral)
- CSF then flows around the cerebral hemispheres and spinal cord
- Flow is aided by the ciliary movement of ependymal cells
- Reabsorbed primarily by the arachnoid villi of the dural venous sinuses
