It lines the lumen of the vessels, and is a thin layer of endothelium.
tunica media
Endocardium
the layers that make up the heart are the tunica externa, tunica media, and tunica interna.
These are venous valves.
Tunica interna
The tunica media is the thickest layer of of an artery
Tunica interna
The folds of the tunica interna, also known as the endothelium, allow for expansion and contraction during changes in blood flow or pressure. This flexibility helps to accommodate variations in blood volume and maintain proper vascular function.
it has a single tunic- only the tunica interna
Blood vessels are composed of three layers of tissue: tunica externa, tunica media, and tunica interna. The middle layer, tunica media, is composed of smooth muscle and is thickest in arteries because they need to accommodate the higher pressures created by the heart's pumping action which distributes blood throughout the body.
Arteries are not one cell thick. They are multicelluar in their formation. They contain three distinct layers; tunica interna (or intima made of endothelial tissue), tunica media (muscular tissue), and tunica externa (serous membrane).
The tunica interna of an elastic artery has subendothelial laminas of elastic fibres. Its tunica media has many fenestrated elastic membranes alternating with smooth muscle fibres. An elastic artery also has external elastic lamina. Its tunica externa is thin and contains vasa vasorum.