What is the Function of the Arachnoid Villi

Question

What is the function of the arachnoid villi?
A) Secretion of CSF from the blood within the dural sinuses into the subarachnoid space
B) Phagocytosis of germ-laden CSF
C) Diffusion of CSF from the subarachnoid space into the blood within the dural sinuses
D) Synthesis of myelin sheath

Accepted Answer

The arachnoid villi are finger-like projections of the arachnoid mater that protrude through the dura mater into the venous sinuses of the brain. Their primary function is to allow for the passage of CSF from the subarachnoid space into the venous blood within the dural sinuses. This process is important for maintaining the proper volume and pressure of CSF in the brain and spinal cord.