The outermost wall of an artery or vein is called the __________ and in large arteries and veins contains the __________.

Question

Quizplus · Accepted Answer

The outermost wall of an artery or vein is called the tunica externa and in large arteries and veins it contains the vasa vasorum, a network of small blood vessels that supply oxygen and nutrients to the outer layers of the vessel wall. The tunica media is the middle layer of the vessel wall, consisting of smooth muscle and elastic fibers. The tunica intima is the innermost layer, consisting of the endothelium and basement membrane. Valves are structures found within veins, not in the tunica externa.

The Outermost Wall of an Artery or Vein Is Called