Adult Echocardiography Practice Exam

The outer layer of tissue in arteries is referred to as the tunica adventitia. This layer is primarily composed of connective tissue and serves several important functions. It provides structural support and stability to the artery, ensuring that it can withstand the pressure exerted by the blood flow within. Additionally, the tunica adventitia contains larger blood vessels (vasa vasorum) that supply blood to the walls of the larger arteries, as well as nerve fibers that help regulate the blood vessel's function.

The tunica intima is the innermost layer, consisting of endothelial cells that provide a smooth lining for blood flow. The tunica media is the middle layer, primarily composed of smooth muscle and elastin, which helps regulate the diameter of the artery and control blood pressure. The tunica cardia does not correspond to any recognized layer of blood vessels; it may be a misnomer or confusion with cardiac tissue. Understanding the roles and locations of these layers is essential in comprehending vascular anatomy and physiology.