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Pectoralis MajorLatin, pectoralis, relating to the chest; major, larger.OriginClavicular headAnterior surface of medial half of clavicle.Sternocostal headAnterior surface of sternum. First seven costal cartilages. Sternal end of sixth rib. Aponeurosis of external oblique.InsertionLateral lip of intertubercular sulcus of humerus.Nerve supplyMedial and lateral pectoral nerves: clavicular head: C5, 6; sternocostal head: C6–8, T1.Blood supplyPectoral branch of thoracoacromial trunk and lateral thoracic artery(from axillary artery).ActionFlexion, adduction, and medial rotation of arm at glenohumeral joint.Clavicular headFlexion of extended arm.Sternocostal headExtension of flexed arm.

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