The subclavian arteries are paired major arteries of the upper thorax (chest), below the clavicle (collar bone) in human anatomy. They receive blood from the aortic arch. The left subclavian artery supplies blood to the left arm and the right subclavian artery supplies blood to the right arm, with some branches supplying the head and thorax. On the left side of the body, the subclavian comes directly off the arch of aorta.