What is the outer layer of a blood vessel called?

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Multiple Choice

What is the outer layer of a blood vessel called?

Explanation:
Vessel walls have layers, and the outermost one is the tunica externa (also called adventitia). This layer is made of connective tissue rich in collagen, which provides structural support and helps anchor the vessel to surrounding tissues. Inside, the innermost layer is the tunica intima (the endothelial lining) and the middle layer is the tunica media (smooth muscle). The aorta is an example of a vessel, not a layer, and phlebitis refers to inflammation of a vein. So the outer layer is tunica externa.

Vessel walls have layers, and the outermost one is the tunica externa (also called adventitia). This layer is made of connective tissue rich in collagen, which provides structural support and helps anchor the vessel to surrounding tissues. Inside, the innermost layer is the tunica intima (the endothelial lining) and the middle layer is the tunica media (smooth muscle). The aorta is an example of a vessel, not a layer, and phlebitis refers to inflammation of a vein. So the outer layer is tunica externa.

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