Advanced Basilar Artery Quiz

Q1. Why can basilar artery occlusion produce extensive bilateral neurological deficits?

• It supplies multiple bilateral brainstem and posterior circulation territories
• It supplies only one small cortical gyrus
• It carries venous blood from both hemispheres
• It is exclusively a meningeal artery

Q2. How can basilar artery occlusion produce locked-in syndrome?

• Only peripheral motor nerves are damaged
• Bilateral ventral pontine motor pathways can be interrupted while consciousness is preserved
• Both hippocampi are selectively destroyed
• The spinal dorsal columns are isolated below the medulla

Q3. Why can AICA ischemia affect both facial movement and hearing or balance?

• AICA directly supplies the facial muscles outside the skull
• AICA territory includes lateral pontine facial pathways and may supply the inner ear
• Hearing depends solely on the anterior cerebral artery
• AICA supplies only the occipital cortex

Q4. Why is the basilar apex an important site in aneurysm anatomy?

• It is a major arterial bifurcation at the origin of the posterior cerebral arteries
• It is outside the subarachnoid space
• It is the site where the internal carotid arteries fuse
• It contains the superior sagittal sinus

Q5. Which nearby cranial nerve can be affected by pathology around the basilar apex and proximal posterior cerebral arteries?

• Hypoglossal nerve in the carotid triangle
• Oculomotor nerve
• Olfactory nerve
• Facial nerve within the parotid gland

Q6. Why can small basilar perforator occlusions produce focal pontine syndromes even when the main basilar lumen remains patent?

• Pontine neurons receive blood directly from cerebrospinal fluid
• All pontine tissue is supplied only by the posterior cerebral arteries
• Small pontine branches supply discrete brainstem territories
• Perforators carry venous rather than arterial blood

Q7. What does basilar artery fenestration describe?

• The artery becomes a vein before reaching the pons
• The artery terminates as a single anterior cerebral artery
• A segment divides into two channels that later rejoin
• The artery passes through a skull foramen twice

Q8. Why is collateral flow through posterior communicating arteries clinically relevant in basilar or posterior circulation disease?

• They supply the spinal cord without entering the cranium
• They directly connect the basilar artery to the superior sagittal sinus
• They always replace both vertebral arteries
• They can connect anterior and posterior arterial circulations

Q9. How can a basilar artery lesion threaten respiratory and cardiovascular function?

• The basilar artery supplies only skeletal muscle
• Respiratory control is confined to the frontal cortex
• Brainstem ischemia can involve vital autonomic and respiratory control regions
• Cardiovascular control occurs only in peripheral ganglia

Q10. Which statement best integrates basilar artery anatomy?

• It arises from the internal carotid artery and ends as the middle cerebral artery
• It is a dural artery that terminates in the superior sagittal sinus
• It is formed by the vertebral arteries, supplies the pons and cerebellum through branches, and ends as the posterior cerebral arteries
• It arises from the anterior cerebral artery and supplies only the frontal lobe