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Pectoralis Major:
Proximal Attachment - Clavicular head: anterior surface of medial half of clavicle ;
Sternocostal Head: anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle
Distal Attachment - Lateral lip of intertubercular sulcus of humerus
Innervation - Lateral and medial pectoral nerves, clavicular head, sternocostal head
Action - Adducts and medially rotates humerus, draws scapula anteriorly and inferiorly; Acting alone, clavicular head flexes humerus and sternocostal head extends it from the flexed position