Which vessel layer is the outermost layer?

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Multiple Choice

Which vessel layer is the outermost layer?

Explanation:
The outermost vessel layer is the tunica adventitia, a sheath of connective tissue that blends with surrounding structures and provides structural support. In large vessels it also houses the vasa vasorum and nervi vasorum to supply the wall. The inner lining is the tunica intima, which includes the endothelium, and the middle muscular layer is the tunica media, rich in smooth muscle. Endothelium is specifically the single-cell lining of the intima, not the outermost layer.

The outermost vessel layer is the tunica adventitia, a sheath of connective tissue that blends with surrounding structures and provides structural support. In large vessels it also houses the vasa vasorum and nervi vasorum to supply the wall. The inner lining is the tunica intima, which includes the endothelium, and the middle muscular layer is the tunica media, rich in smooth muscle. Endothelium is specifically the single-cell lining of the intima, not the outermost layer.

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