CLINICAL MEDICINE

Detailed explanation-1: -CSF is not produced by the CP alone, and the arachnoid granulations (or villi) are not the primary absorption sites of CSF. A considerable amount of CSF is also absorbed by the lymphatic system.

Detailed explanation-2: -In the cranial subarachnoid space, CSF flows towards arachnoid villi in the wall of venous sinuses from which it is absorbed. Part of the CSF is absorbed by the olfactory mucosa and cranial nerve (optic, trigeminal, facial and vestibulocochlear nerves) sheaths and is drained by the lymphatic system.

Detailed explanation-3: -Absorption of the CSF into the blood stream takes place in the superior sagittal sinus through structures called arachnoid villi . When the CSF pressure is greater than the venous pressure, CSF will flow into the blood stream.

Detailed explanation-4: -The CSF flows over the surface of the brain and down the length of the spinal cord while in the subarachnoid space. It leaves the subarachnoid space through arachnoid villi found along the superior sagittal venous sinus, intracranial venous sinuses, and around the roots of spinal nerves.