The __________________ runs the length of the falx cerebri.

The superior sagittal sinus is a large venous sinus located along the midline of the brain, running in the falx cerebri, which is a sickle-shaped fold of dura mater that separates the two cerebral hemispheres. This sinus plays a crucial role in venous drainage, collecting blood from the brain’s cortex and superficial areas, and channeling it toward the confluence of sinuses at the back of the skull. Its orientation running parallel to the falx cerebri aligns with the anatomical structure, confirming its relationship to this specific fold of dura mater.

Other options do not represent structures that run along the falx cerebri. The frontal sinus is located in the forehead region and has no connection to the falx. The transverse anterior sinus does not exist in standard anatomical terms; there is a transverse sinus that runs horizontally at the back of the skull but does not align with the falx cerebri. The term cerebral sinus is too vague, as it does not refer specifically to a known structure related to the falx cerebri.