Which term represents the inner layer of the vessel wall?

Which term represents the inner layer of the vessel wall?

• A. Internal Elastic Lamina
• B. Intima
• C. Adventitia
• D. Media

Answer: (B)

The inner lining of a blood vessel is the tunica intima. It lines the lumen and consists of endothelial cells, a basement membrane, and often a subendothelial connective tissue layer. In arteries, there’s an internal elastic lamina that marks the boundary between the intima and the middle tunica media, but that elastic layer is a boundary feature, not the inner lining itself. The middle layer, tunica media, contains smooth muscle and elastic fibers, while the outer layer, tunica adventitia, is connective tissue.

The inner lining of a blood vessel is the tunica intima. It lines the lumen and consists of endothelial cells, a basement membrane, and often a subendothelial connective tissue layer. In arteries, there’s an internal elastic lamina that marks the boundary between the intima and the middle tunica media, but that elastic layer is a boundary feature, not the inner lining itself. The middle layer, tunica media, contains smooth muscle and elastic fibers, while the outer layer, tunica adventitia, is connective tissue.