Anatomical Surface of the Pectoral Region in the Male Thorax

Description

Anterior thoracic surface anatomy of the adult male is centered on pectoralis major, its broad clavicular and sternocostal parts spanning from the medial clavicle and sternum to the lateral lip of the intertubercular sulcus of the humerus, forming the anterior axillary fold laterally. Deep to it, pectoralis minor runs superolaterally from ribs 3 to 5 toward the coracoid process, occupying a more superior and medial plane relative to the anterior chest wall. The pectoral region (regio pectoralis) is framed superiorly by the clavicle, medially by the sternal border, and laterally by the axillary margin over the proximal arm. Surface contour matters. Clinically, the layered relationship of pectoralis major over pectoralis minor underpins safe dissection planes during mastectomy and subpectoral implant placement, where the surgeon must respect the pectoral fascia and the intended pocket relative to the muscle’s inferolateral fibers. The same anatomy guides recognition of pectoralis major rupture, often at the humeral insertion after heavy bench pressing, where loss of the anterior axillary fold and medial retraction of the muscle belly are classic findings. On a teaching level, this view supports palpation-based localization of the deltopectoral groove and the general course of the cephalic vein when planning anterior shoulder or thoracic access. Use this illustration for gross anatomy and surface anatomy modules on the anterior thorax, for surgical atlases covering breast and chest wall approaches, and for sports medicine or orthopedic publications discussing tendon rupture patterns and repair landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.