Question

Which one of the following structures allows CSF to pass from the subarachnoid space to the superior sagittal sinus?

a. inter-vertebral foramina
b. choroid plexuses
c. corpus callosum
d. arachnoid villi

Answer 1

The structure that permits CSF to move from the subarachnoid space to the superior sagittal sinus is the arachnoid villi. They serve as one-way valves that enable the CSF to drain into the venous system.

Step-by-step explanation:

The structure that allows CSF (cerebrospinal fluid) to pass from the subarachnoid space to the superior sagittal sinus is the arachnoid villi. The arachnoid villi act as one-way valves that permit the CSF to drain into the venous system. Here is a step-by-step explanation:

1. The CSF circulates around the brain and spinal cord in the subarachnoid space.
2. When the pressure of CSF is higher in the subarachnoid space than in the superior sagittal sinus, the one-way valve system of the arachnoid villi allows the transfer of CSF.
3. The CSF then enters the superior sagittal sinus, which is a dural venous sinus, and ultimately returns to the bloodstream.

The other options: inter-vertebral foramina, choroid plexuses, and corpus callosum, do not serve the function of transferring CSF into the venous system. Inter-vertebral foramina are passageways for spinal nerves, choroid plexuses produce CSF, and the corpus callosum is a brain structure that connects the two cerebral hemispheres.