Which sinus is associated with the occipital bone?

• A. Superior sagittal sinus
• B. Transverse sinus
• C. Occipital sinus
• D. Inferior sagittal sinus

Answer: (C)

The occipital sinus is a venous sinus located within the tents of the cerebellum, closely associated with the occipital bone at the posterior part of the skull. It runs along the midline within the falx cerebelli, which is a small fold of dura mater. This sinus is considered part of the drainage system for the brain, collecting blood from the inferior aspects of the brain and draining into the confluence of sinuses.

The superior sagittal sinus and inferior sagittal sinus are more associated with the falx cerebri and the structures along the midline of the brain but are not directly related to the occipital bone. The transverse sinus, while it eventually contributes to venous drainage from the occipital area, is primarily associated with the lateral aspects of the skull, specifically the ridge of the tentorium cerebelli. This differentiation makes the occipital sinus the correct association with the occipital bone itself, emphasizing its unique anatomical relationship and function in venous drainage.