Intermediate Superior Sagittal Sinus Quiz

Q1. What are the lateral lacunae associated with the superior sagittal sinus?

• Branches of the anterior cerebral artery
• Air-filled cavities in the frontal bone
• Extensions of the lateral ventricles
• Venous spaces that communicate with the superior sagittal sinus

Q2. What is the principal role of arachnoid granulations near the superior sagittal sinus?

• Arterial supply of the falx
• Production of cerebrospinal fluid
• Transfer of cerebrospinal fluid into the venous circulation
• Motor innervation of the dura

Q3. What defines a bridging vein near the superior sagittal sinus?

• A cerebral vein crossing from the brain surface to a dural sinus
• A lymphatic vessel traversing the skull base
• A vein joining the two internal jugular veins
• An artery connecting two cerebral arteries

Q4. Why are parasagittal cortical veins anatomically important?

• They drain cortical territories into the superior sagittal sinus
• They produce cerebrospinal fluid
• They provide the main arterial supply to the cortex
• They drain only the brainstem

Q5. Which vessels can connect the superior sagittal sinus with extracranial venous networks?

• Emissary veins
• Anterior choroidal arteries
• Lenticulostriate arteries
• Posterior communicating arteries

Q6. Why does the superior sagittal sinus not collapse as readily as an ordinary peripheral vein?

• Its walls are supported by dura
• Its wall contains cardiac muscle
• Its lumen is reinforced by cartilage
• Its wall contains a thick arterial elastic lamina

Q7. How does the superior sagittal sinus generally change in size as it courses posteriorly?

• It progressively narrows to a blind end
• It becomes progressively larger
• It remains exactly uniform in caliber
• It becomes a cerebral artery

Q8. Which cerebral surface commonly drains through veins entering the superior sagittal sinus near the falx?

• Medial cerebral surface
• Orbital contents only
• Inferior cerebellar surface only
• Middle ear mucosa

Q9. Why can superior sagittal sinus blood preferentially enter one transverse sinus at the confluence?

• The sinus becomes paired arteries posteriorly
• Transverse sinus dominance can create asymmetric outflow
• One transverse sinus normally closes in adulthood
• Valves alternate flow between sides

Q10. How does the location of the superior sagittal sinus differ from that of the inferior sagittal sinus?

• Both occupy the same superior falcine margin
• Both lie in the free edge of the tentorium
• They occupy the attached superior and free inferior margins of the falx, respectively
• Both lie in the cavernous sinus