WCUI/Smith Chason Exit Assessment – Abdomen, Vascular, OB/GYN Practice Test

The outermost layer of an artery is the tunica adventitia (also called tunica externa). This layer is a fibrous connective tissue sheath that wraps around the vessel, providing structural support and anchoring the artery to surrounding tissues. It also contains small vessels and nerves that supply the artery itself (the vasa vasorum and nervi vascularis). The inner lining is the tunica intima, which covers the lumen with endothelium, and the middle layer is the tunica media, composed primarily of smooth muscle and elastic fibers that regulate vessel diameter. So the outermost layer is the tunica adventitia.