Clavicular head: anterior surface of medial half of clavicle Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle
Insertion
Lateral lip of intertubercular groove of humerus
Action
Adducts and medially rotates humerus; draws scapul anteriorly and inferiorly Acting alone: clavicular head flexes humerus and sternocostal head extends it
Innervation
Lateral and medial pectoral nerves; clavicular head (C5 and C6, sternocostal head (C7, C8, and T1)
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