Intermediate Transverse Sinus Quiz

Q1. Along which tentorial margin does the transverse sinus run?

• Free anterior tentorial edge
• Anterior margin of the diaphragma sellae
• Medial free border of the falx cerebri
• Attached posterolateral margin of the tentorium cerebelli

Q2. Which cerebral vein may drain into the transverse sinus or transverse-sigmoid junction?

• Great cerebral vein
• Central retinal vein
• Internal cerebral vein
• Vein of Labbe

Q3. Which sinus can join the transverse sinus near its lateral portion and the transverse-sigmoid junction?

• Intercavernous sinus
• Basilar venous plexus only
• Superior petrosal sinus
• Inferior sagittal sinus

Q4. Which venous territories can contribute directly or indirectly to the transverse sinus?

• Coronary veins only
• Portal venous tributaries only
• Cerebral, cerebellar, diploic, and dural venous territories
• Pulmonary veins only

Q5. Why are the right and left transverse sinuses often unequal in size?

• The sinuses contain alternating one-way valves
• One transverse sinus normally closes in adulthood
• One transverse sinus is often developmentally dominant
• One side becomes an artery after birth

Q6. Which skull landmark is closely associated with the medial origin of the transverse sinus grooves?

• Anterior clinoid process
• Mandibular fossa
• Cribriform plate
• Internal occipital protuberance

Q7. How does the transverse sinus relate to the cerebellum?

• It lies along the tentorial boundary superior to the posterior fossa contents
• It passes through the cerebellar cortex
• It forms the cerebellar peduncle
• It lies inside the fourth ventricle

Q8. Why is the transverse sinus considered valveless?

• It contains arterial semilunar valves
• It lacks conventional venous valves
• Its lumen is divided by cardiac valves
• It is isolated from other venous channels

Q9. Which structure marks the transition from the transverse sinus into the sigmoid sinus?

• The cribriform plate
• The optic canal
• The foramen rotundum
• A curved transition at the posterolateral cranial cavity

Q10. Why can venous imaging show markedly different transverse sinus calibers in a healthy person?

• The sinus caliber is fixed by arterial pressure
• Both transverse sinuses must always have identical diameters
• A small transverse sinus always proves acute thrombosis
• Normal transverse sinus dominance and asymmetry are common