Circulation of cerebrospinal fluid csF drains from lateral ventricle interventricular foramina third ventricle mesencephalic aqueduct fourth ventricle median and two lateral apertures subarachnoid space_arachnoid granulations superior sagittal sinus_veinCirculation of cerebrospinal fluid CSF drains from lateral ventricle interventricular foramina third ventricle mesencephalic aqueduct fourth ventricle median and two lateral apertures subarachnoid space arachnoid granulations superior sagittal sinus vein