The Axillary artery, a continuation of the subclavian, begins at the first ribís lateral border. It ends at the inferior border of the teres major where it becomes brachial. The artery's branches are superior thoracic, thoraco-acromial, lateral thoracic, subscapular, anterior and posterior circumflex humeral. The pectoralis minor muscle crosses the axillary artery, dividing it into three parts: proximal, distal, and posterior to the muscle.
Axillary compression is most effective against the humerus. Except for the popliteal, the axillary artery is more frequently lacerated by violence than any other, being most susceptible when diseased. It has been ruptured in attempts to reduce old dislocations, especially when the artery is adherent to the articular capsule.