Sagittal section of the brain

Ventricular system

CSF flow: CSF production: produced by choroid plexuses in the lateral, third, and fourth ventricles by filtration of plasma → lateral ventricles → third ventricle (via interventricular foramina) → fourth ventricle (via cerebral aqueduct) → diffusion and active transfer into the subarachnoid space (via foramina of Luschka and Magendie) → reabsorption in the arachnoid granulations (a group of projections of the arachnoid mater into the dural sinuses) → drainage into the dural venous sinuses → internal jugular veins, ultimately heart