Pectoralis Major


Origin: Sternal half of the Clavicle, sternum to 7th rib, cartilages of true ribs, aponeurosis of external oblique

Insertion: Lateral lip of bicipital groove of the Humerus

Function: Adducts arm, extends arm, internal rotation of the shoulder along with other

Muscles which produce shoulder Adduction

Muscles which produce shoulder Extension

Muscles which produce shoulder Internal (medial) Rotation

Nerve: dual innervation by the Medial Pectoral Nerve and the Lateral Pectoral Nerve

Artery: Pectoral branch of Thoracoacromial artery and the Internal Mammary artery

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