[ sŭb′ĕn-dō-thē′lē-əl ] n. The thin layer of connective tissue lying between the endothelium and elastic lamina in the intima of blood vessels.

What does Subendothelial structures include?

Endocardium and Heart Valves The subendocardial layer contains vascular structures, elastic and collagen bands, and fibroblasts and is continuous with the myocardium. Purkinje fibers are located in the subendocardium.

What vessels have vasa vasorum?

The vasa vasorum are found in large veins and arteries such as the aorta and its branches. These small vessels serve to provide blood supply and nourishment for tunica adventitia and outer parts of tunica media of large vessels.