Which vascular layer is weakened in berry aneurysms?

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Multiple Choice

Which vascular layer is weakened in berry aneurysms?

Explanation:
Berry aneurysms arise where the wall has a focal deficiency in the tunica media, the muscular-elastic layer of the vessel. This medial thinning at arterial bifurcations—especially in the Circle of Willis—creates a thin-walled, saccular outpouching that can rupture, causing subarachnoid hemorrhage. The endothelium and intima line the lumen, and the adventitia forms the outer layer, but the weakening that forms the aneurysm is in the tunica media.

Berry aneurysms arise where the wall has a focal deficiency in the tunica media, the muscular-elastic layer of the vessel. This medial thinning at arterial bifurcations—especially in the Circle of Willis—creates a thin-walled, saccular outpouching that can rupture, causing subarachnoid hemorrhage. The endothelium and intima line the lumen, and the adventitia forms the outer layer, but the weakening that forms the aneurysm is in the tunica media.

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