Which sinus is located in the midline between the two hemispheres, running from front to back along the inferior edge of the falx cerebri?

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

Answer: (D)

The midline venous channel in front-to-back orientation along the lower edge of the falx cerebri is the inferior sagittal sinus. It sits in the inferior margin of the falx, between the two cerebral hemispheres, collecting from deep cerebral veins and the great vein of Galen, then draining into the straight sinus where the falx meets the tentorium. This distinguishes it from the superior sagittal sinus, which runs along the falx’s upper edge, the transverse sinuses, which run laterally, and the straight sinus, which lies at the junction of the falx and tentorium and continues posteriorly.