The pectoralis major muscle originates from multiple locations, including the costal cartilage of ribs two through six, the sternum, the medial half of the clavicle and the external oblique fascia.

2 Department of Anatomy, University of Stellenbosch, Plattekloof, Cape Town, South Africa Correspondence to: Dr D N Bhatia Cape Shoulder Institute, Suite no 4, Medgroup Anlin House, 43 Bloulelie ...