Action

• Pectoralis Major

  Action: Adducts arm and rotates it medially; clavicular fibers also flex arm
• Pectoralis Minor

  Action: Depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin
• Subclavius

  Action: Depresses the clavicle and steadies this bone during movements of the shoulder girdle
• Serratus Anterior

  Action: Draws the forward anterior around the thoracic wall; rotates scapula