<unk>  are small blood vessels that comprise a vascular network supplying the walls of large blood vessels, such as elastic arteries (e.g., the aorta) and large veins (e.g., the venae cavae). The name derives . Occasionally two different singular forms are seen:<unk>  vasis () and vas vasis ().
Vasa vasorum
Lymphatic endothelium
Fovea centralis
Node of Ranvier
Corpora quadrigemina
Caliber persistent artery
Neurilemma
Postganglionic nerve fibers