Advanced Superior Sagittal Sinus Quiz

Q1. Why can thrombosis of the superior sagittal sinus cause extensive cortical venous congestion?

• Both internal carotid arteries traverse it
• It drains only the scalp
• It receives numerous superficial cerebral veins
• It supplies the cortex with arterial blood

Q2. How can superior sagittal sinus thrombosis produce a hemorrhagic venous infarct?

• It obstructs only extracranial lymphatics
• It stops all cerebrospinal fluid production
• Elevated venous pressure can impair perfusion and promote hemorrhage
• The thrombosis directly blocks the basilar artery

Q3. Why can thrombosis of the superior sagittal sinus contribute to raised intracranial pressure?

• It enlarges the carotid arteries
• It directly increases cerebrospinal fluid production by the choroid plexus
• It can impair cerebrospinal fluid absorption by increasing venous sinus pressure
• It blocks the cerebral aqueduct from inside

Q4. Why are bridging veins susceptible to tearing during acceleration or deceleration of the brain?

• They cross between the mobile brain and relatively fixed dura
• They are high-pressure arteries
• They run entirely inside skull bone
• They pass through the carotid canal

Q5. Which collection can result from tearing of bridging veins?

• Intraventricular hemorrhage from the choroid plexus
• Epidural hematoma from a middle meningeal artery tear
• Subdural hematoma
• Subarachnoid hemorrhage from an arterial aneurysm

Q6. Why can sacrifice of a major parasagittal bridging vein during surgery be harmful?

• It can compromise venous drainage of the associated cortex
• It stops cerebrospinal fluid production
• It interrupts a cranial nerve
• It removes the main arterial supply to the cortex

Q7. Why can a parasagittal meningioma involving the superior sagittal sinus create a difficult venous anatomy problem?

• The sinus and nearby bridging veins may be critical venous outflow pathways
• The sinus contains the anterior cerebral artery
• The sinus contains the corticospinal tract
• The sinus is the principal site of cerebrospinal fluid production

Q8. How may chronic obstruction of the superior sagittal sinus be partially compensated?

• Collateral venous channels can enlarge and redirect blood
• The superior sagittal sinus becomes an artery
• The ventricles drain directly into the jugular vein
• Cerebral arteries convert into veins

Q9. Why can posterior superior sagittal sinus occlusion have different consequences from a small anterior occlusion?

• Only the anterior sinus receives cerebral veins
• Valves isolate each segment from the others
• Every segment has identical tributaries and flow
• Different segments receive different tributaries and volumes of venous blood

Q10. Which statement best integrates superior sagittal sinus anatomy and function?

• It is a deep cerebral vein that directly becomes the internal jugular vein
• It is a midline falcine dural sinus receiving superficial cerebral veins and draining posteriorly toward the confluence
• It is an artery supplying the medial cerebral cortex
• It is a lymphatic vessel contained in the falx