Which artery is a major branch that supplies the left arm?

• A. Left Subclavian Artery
• B. Left Coronary Artery
• C. Left Pulmonary Vein
• D. Descending Aorta

Answer: (A)

The major source that delivers blood to the left upper limb is the left subclavian artery. It branches off the aortic arch and travels under the clavicle, then continues as the axillary artery in the armpit and later the brachial artery down the arm, supplying the muscles and tissues of the shoulder, arm, and forearm. This pathway makes it the primary artery for the left arm’s blood supply.

The left coronary artery stays with the heart itself, supplying the heart muscle. The left pulmonary vein carries oxygenated blood from the left lung to the left atrium, not an artery supplying the arm. The descending aorta carries blood downward to many thoracic and abdominal structures but does not provide the single main arterial supply to the left arm.