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- Pectoralis major- Origin: clavicular head: medial 1/2 of clavicle; sternocostal head: anterolateral surface of sternum, 1st-6th costal cartilages, aponeurosis of external abdominal oblique- insertion: lateral lip of the intertubercular groove of the humerus- Innervation: medial pectoral n. (C8-T1) and lateral pectoral n. (C5-C7)- Action: Humeral adduction, medial rotation. Sternocostal head helps extend a flexed humerus, Clavicular head helps flex humerus
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