There are two subclavian arteries that supply our arms with blood. The subclavian arteries branch to the vertebral arteries, which carry oxygenated blood up to the brain from the base of the neck. The right subclavian artery, which is located below the clavicle, branches off the brachiocephalic trunk. The left subclavian artery branches off the arch of the aorta and ends at the first rib's lateral edge, where it turns into the axillary artery. Each subclavian artery is split into three parts of the scalenus anterior muscle: the first, from the origin up to the muscle; the second, approximates the muscle; and the third, lateral to the muscle. Each subclavian artery extends about two centimetres above the neck's clavicle, which is located above the pleura's apex. It is possible for an aneurysm, an abnormal blood vessel dilation, to form in one subclavian artery or in both. Some of the most common causes of an aneurysm of the subclavian artery are post-traumatic causes (e.g., being shot), thoracic outlet obstruction, arteriosclerosis (when the arteries harden), and malpositionings.