Pectoralis Minor Muscle Beneath the Skin

Description

Beneath the anterior chest skin of an adult male, the pectoralis minor lies deep to pectoralis major, its thin fascicles coursing superolaterally from the anterior surfaces of ribs 3 to 5 near their costal cartilages toward the coracoid process of the scapula. Medially, the muscle sits close to the sternum and costochondral junctions, while laterally it approaches the axilla where it forms part of the anterior wall. Its tendon reaches the superior, anterior scapular region at the coracoid, with the clavicle and glenohumeral region lying superior and lateral to its line of pull. Clinically, pectoralis minor is a key landmark because the axillary artery and brachial plexus cords travel in its vicinity, and tightness or hypertrophy can contribute to pectoralis minor syndrome within the spectrum of thoracic outlet disorders. An inferiorly and anteriorly tilted scapula from a shortened pectoralis minor narrows the retropectoralis space and can provoke paresthesia or vascular symptoms during overhead activity. Surgeons also orient to this muscle during axillary exposure and when planning a coracoid-based approach, since its insertion helps define the relationship between the coracoid, clavipectoral fascia, and the deeper neurovascular bundle. Small muscle, big consequence. Use this artwork for gross anatomy teaching on the layered anterior thoracic wall, for sports medicine and physical therapy materials on scapular dyskinesis, or for surgical education illustrating safe dissection planes deep to pectoralis major. It also fits textbooks and patient-facing diagrams that need a realistic male chest surface while still calling out the deep attachment points of pectoralis minor beneath overlying structures. Anatomical accuracy verified by SciePro's Medical Advisory Board.