What are the primary tributaries of the inferior sagittal sinus?

What are the primary tributaries of the inferior sagittal sinus?

• A. Nuchal veins
• B. Superior cerebral veins directly into transverse sinus
• C. Deep cortical veins that drain into the great cerebral vein and then the straight sinus
• D. Superficial temporal veins

Answer: (C)

The main idea is how deep cerebral venous drainage reaches the inferior sagittal sinus. Deep parts of the brain drain via deep cortical veins that come together to form the great cerebral vein (vein of Galen). This vein then empties into the straight sinus. The inferior sagittal sinus lies along the inferior edge of the falx cerebri and drains into the straight sinus, so the deep cortical veins—through the vein of Galen and into the straight sinus—constitute the primary deep venous tributaries contributing to this system. In other words, deep cortical veins feed into the great cerebral vein, which via the straight sinus links to the inferior sagittal sinus. The other venous sources listed (nuchal veins, superficial or temporal veins) are part of superficial or external drainage pathways and do not represent the main contributors to the inferior sagittal sinus.

The main idea is how deep cerebral venous drainage reaches the inferior sagittal sinus. Deep parts of the brain drain via deep cortical veins that come together to form the great cerebral vein (vein of Galen). This vein then empties into the straight sinus. The inferior sagittal sinus lies along the inferior edge of the falx cerebri and drains into the straight sinus, so the deep cortical veins—through the vein of Galen and into the straight sinus—constitute the primary deep venous tributaries contributing to this system. In other words, deep cortical veins feed into the great cerebral vein, which via the straight sinus links to the inferior sagittal sinus. The other venous sources listed (nuchal veins, superficial or temporal veins) are part of superficial or external drainage pathways and do not represent the main contributors to the inferior sagittal sinus.