Which sinus receives blood from the top of the brain and serves as the main sinus for CSF return?

• A. Inferior Sagittal Sinus
• B. Superior Sagittal Sinus
• C. Transverse Sinus
• D. Straight Sinus

Answer: (B)

The main concept here is how the brain’s venous drainage and CSF return work together. CSF is reabsorbed into the venous system through arachnoid granulations, and most of this reabsorbed CSF enters the dural venous sinuses via the superior sagittal sinus. This sinus runs along the top edge of the falx cerebri and receives blood from the cortical veins draining the superior surface of the brain. Because it’s the primary channel receiving CSF reabsorption, it serves as the main route for CSF return to the venous circulation. The other sinuses drain different regions and are involved in venous drainage but are not the main CSF-absorbing pathway.