Advanced Middle Cerebral Artery Quiz

Q1. Why can a large MCA stem occlusion cause contralateral face and arm weakness greater than leg weakness?

• The MCA directly supplies peripheral arm nerves
• The lateral motor cortex for face and upper limb lies mainly in MCA territory
• Leg corticospinal fibers do not enter the brain
• The lower limb motor cortex lies in the occipital lobe

Q2. Why can a dominant superior division MCA infarct produce expressive aphasia?

• It can damage dominant inferior frontal language cortex
• It interrupts only cerebellar pathways
• It damages the nondominant occipital pole
• It selectively destroys the primary visual cortex

Q3. Why can a dominant inferior division MCA infarct produce receptive aphasia?

• It supplies only the basal ganglia
• It interrupts the corticospinal tract in the medulla
• It damages the medial leg motor cortex
• It can damage posterior temporal language comprehension cortex

Q4. Why can a nondominant MCA infarct cause hemispatial neglect?

• It interrupts only auditory pathways
• It selectively injures the pituitary gland
• It can damage lateral parietal attention networks
• It always destroys the optic chiasm

Q5. Why can lenticulostriate artery occlusion produce a dense motor deficit without a large cortical infarct?

• Compact motor fibers in the internal capsule can be affected by a small deep infarct
• The internal capsule contains only sensory fibers
• Lenticulostriate arteries supply only scalp muscles
• Motor fibers are absent from cerebral cortex

Q6. Why are lenticulostriate arteries clinically associated with hypertensive intracerebral hemorrhage?

• Small penetrating vessels can undergo pressure-related damage and rupture
• They normally contain no blood pressure
• They are veins rather than arteries
• They lie outside the skull

Q7. What is an important anatomical consequence of an early MCA bifurcation?

• It eliminates the internal carotid artery
• It prevents all lenticulostriate branches from forming
• It converts the MCA into a venous sinus
• It alters proximal branch anatomy and relationships of the M1 segment

Q8. Why are MCA bifurcation aneurysms anatomically important?

• They arise inside the superior sagittal sinus
• They form at the vertebral artery union
• They occur at a major Sylvian branch point near important cortical vessels
• They are located only within the cerebellum

Q9. Why can proximal MCA occlusion cause both cortical signs and deep motor deficits?

• The MCA supplies only the spinal cord
• The MCA supplies only the cerebral cortex
• Deep structures receive blood exclusively from the basilar artery
• It can compromise both cortical branches and deep perforating arteries

Q10. Which statement best integrates middle cerebral artery anatomy?

• It arises from the basilar artery and supplies only the cerebellum
• It is a meningeal artery supplying only dura
• It is an internal carotid branch with Sylvian cortical branches and deep perforators
• It is a vertebral branch supplying only the medial occipital lobe