Acromial Branch of the Thoracoacromial Artery, Anterior View

Description

Running anteriorly from the second part of the axillary artery, the thoracoacromial trunk pierces the clavipectoral fascia and gives rise to an acromial branch that courses superolaterally toward the acromion and lateral clavicle. Along its path, the vessel lies deep to the clavicular head of pectoralis major and approaches the deltopectoral region near the cephalic vein, then swings laterally toward the anterior border of the deltoid. The clavicle, acromion, and proximal humerus frame the field, with the glenohumeral joint centered inferior to the acromioclavicular articulation. Anastomotic channels around the acromion are indicated where the acromial branch meets contributions from the suprascapular and circumflex humeral systems. A key surface landmark. Understanding this artery matters in the shoulder because the acromial branch supplies the deltoid and periarticular tissues and participates in the scapular and acromial arterial networks that maintain perfusion when proximal flow is compromised. The anterior corridor also intersects common surgical and procedural pathways, including the deltopectoral approach and creation of an anterolateral portal in arthroscopy, where unrecognized arterial branches can be a source of postoperative hematoma or troublesome bleeding. Its relationship to the clavipectoral fascia and deltopectoral groove also supports teaching of how the axillary artery branches transition into more superficial regional supply. Ideal use cases include anatomy and surgical skills courses covering the axilla, shoulder girdle, and deltopectoral interval, as well as textbook and atlas figures illustrating thoracoacromial branching patterns and acromial anastomoses. It also suits procedure guides discussing anterior shoulder incisions, pacemaker pocket planning near the clavicle, and vascular injury risk in shoulder trauma. Anatomical accuracy verified by SciePro's Medical Advisory Board.