The sclera and cornea opaque and transparent layer respectively. These arise from the brachiocephalic trunk on the right side and directly from the arch of the aorta on the left. Pin On College The largest arteries in the neck are the common carotids. . A whole skeletal muscle is considered an organ of the muscular systemEach organ or muscle consists of skeletal muscle tissue connective tissue nerve tissue and blood or vascular tissue. The elasticity of blood vessels enables them to circulate blood but hardened plaque in arterial walls makes them too stiff to do this. Structure of Skeletal Muscle. When the heart contracts it pumps blood out through the arteries. Large red vessel the aorta - Large artery that carries blood from of the left ventricle to the arteries of the body. The blood moving through the circulatory system puts pressure on the walls of the blood vessels. The middle layer is thicker in the...