Updated: 5/17/2022

Pectoralis Major

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  • Summary
      • Pectoralis Major
      • Origin
      • 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 scapula anteriorly and inferiorly
      • Acting alone: clavicular head flexes humerus and sternocostal head extends it
      • Innervation
      • Lateral and medial pectoral nerves (C5-T1)
      • Arterial Supply
      • Pectoral branch of the thoracoacromial trunk

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