24. CSF Circulation
The continuous flow of fluid through the brain's ventricles and the surrounding subarachnoid space, starting from the lateral ventricles, moving to the third, then fourth ventricle, exiting into the subarachnoid space (around brain and spinal cord) via small openings, and finally being reabsorbed into the bloodstream, primarily through arachnoid villi, providing cushioning, nutrient transport, and waste removal for the CNS