Intermediate Straight Sinus Quiz

Q1. Where does the inferior sagittal sinus run before contributing to the straight sinus?

• Superior border of the tentorium
• Lateral wall of the cavernous sinus
• Free inferior margin of the falx cerebri
• Floor of the fourth ventricle

Q2. What is the traditional eponym for the great cerebral vein?

• Vein of Labbe
• Vein of Galen
• Vein of Trolard
• Vein of Rosenthal

Q3. Which paired veins unite to form the great cerebral vein?

• External jugular veins
• Internal cerebral veins
• Superior ophthalmic veins
• Facial veins

Q4. Which dural sinus contributes venous blood from the falx and nearby medial cerebral surfaces to the straight sinus?

• Occipital sinus only
• Superior petrosal sinus
• Inferior sagittal sinus
• Sigmoid sinus

Q5. Why does the straight sinus tend to remain patent rather than collapsing like an ordinary thin-walled vein?

• Its walls are supported by firm dural attachments
• Its wall contains thick smooth muscle
• Its lumen contains cartilage
• Its wall is reinforced by ventricular ependyma

Q6. What is the usual posterior destination of the straight sinus?

• Superior ophthalmic vein
• Internal jugular vein without an intervening sinus
• Confluence of sinuses
• Cavernous sinus

Q7. Which structure lies below the tentorium near the straight sinus region?

• Pituitary gland
• Olfactory bulb
• Frontal lobe
• Cerebellum

Q8. What makes the straight sinus a useful landmark on a midsagittal view?

• It forms the cerebral aqueduct
• It marks the central sulcus
• It identifies the carotid bifurcation
• It identifies the falcotentorial junction

Q9. Which deep venous channels are directly upstream from the great cerebral vein?

• Retromandibular veins
• External jugular veins
• Posterior auricular veins
• Internal cerebral veins

Q10. Why may straight sinus blood preferentially drain into one transverse sinus?

• Asymmetry of the confluence and transverse sinuses
• Normal closure of one transverse sinus in adulthood
• Alternating valves inside the straight sinus
• Conversion of the sinus into an artery