The thoracoacromial artery (thoracoacromial trunk) is a short branch of the axillary artery. It contributes to the blood supply of the shoulder and pectoral region. Course The thoracoacromial artery arises from the second part of the axillary artery (posterior to the pectoralis minor muscle). It passes inferiorly along the medial border of the pectoralis minor muscle, before piercing through the clavipectoral fascia. The thoracoacromial artery then divides into four terminal branches: Pectoral Acromial Clavicular Deltoid Biodigital Human Fig 1Course of the thoracoacromial trunk and its four terminal branches Supply Through its terminal branches, the thoracoacromial artery contributes to the blood supply to structures within the shoulder and pectoral regions: Pectoral branch – pectoralis minor and major, breast tissue and overlying skin Acromial branch – deltoid Clavicular branch – sternoclavicular joint, subclavius Deltoid branch – deltoid and pectoralis major Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article