CSF is a clear fluid produced by dialysis of blood in the ''choroid plexus''. Choroid plexuses are found in each lateral ventricle and a pair are found in the third and fourth ventricle. Further production also comes from the ependymal cell linings and vessels within the pia mater. | CSF is a clear fluid produced by dialysis of blood in the ''choroid plexus''. Choroid plexuses are found in each lateral ventricle and a pair are found in the third and fourth ventricle. Further production also comes from the ependymal cell linings and vessels within the pia mater. |