What is the most common site for emboli in ischemic strokes?

What is the most common site for emboli in ischemic strokes?

• A. The posterior cerebral artery
• B. The middle cerebral artery
• C. The anterior communicating artery
• D. The basilar artery

Answer: (B)

Emboli tend to lodge at branching points in large, high-flow vessels, where flow dynamics make a sudden occlusion most likely. The middle cerebral artery fits this pattern well: it arises from the internal carotid and has a large initial segment (M1) that rapidly branches to supply a vast portion of the lateral cerebral cortex. When an embolus occludes this artery, it blocks a large territory, making it the most common site of embolic occlusion in ischemic stroke. Other arteries listed are less commonly involved by emboli and typically produce different clinical patterns.

Emboli tend to lodge at branching points in large, high-flow vessels, where flow dynamics make a sudden occlusion most likely. The middle cerebral artery fits this pattern well: it arises from the internal carotid and has a large initial segment (M1) that rapidly branches to supply a vast portion of the lateral cerebral cortex. When an embolus occludes this artery, it blocks a large territory, making it the most common site of embolic occlusion in ischemic stroke. Other arteries listed are less commonly involved by emboli and typically produce different clinical patterns.