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The axillary artery is the principal arterial supply of the upper limb, commencing as a continuation of the subclavian artery as it emerges from underneath the 1st rib to enter the axilla (see Image. Branches of the Aorta). This blood vessel provides key landmarks for understanding the position of other important structures in the region, particularly the brachial plexus. The axillary artery gives off 6 branches before terminating at the lower border of the teres major by becoming the brachial artery (see Image. Axillary Artery). Pathological conditions that may affect the axillary artery include aneurysms, thrombosis, embolism, arteritis, pseudoaneurysms, and thoracic outlet syndrome. This blood vessel is also critical in trauma management, as traumatic disruptions can cause severe bleeding or ischemia in the upper limb. This artery and its branches serve as vital landmarks during surgical procedures, including bypass grafting, shoulder operations, and axillary lymph node dissections, where avoiding arterial damage is essential. Familiarity with the axillary artery's anatomy and function is necessary to minimize morbidity from conditions affecting the upper limb and ensure successful interventions.