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Pectoralis Major

Origin: Clavicle, Sternum, Ribs 1-6, and External Oblique muscle (via  an aponeurosis)

Insertion: Humerus (Intertubercular groove and crest of greater tubercle)

Action: Shoulder Adduction, Medial Rotation, Flexion of an extended arm, Extension of a flexed arm, Horizonal Adduction

Innervation: C5-T1 (Medial and Lateral Pectoral Nerves)

 

EMG studies: