Pectoralis Major

Pectoralis Major Muscle

Pectoralis major is the largest and most superficial of the two chest muscles. Pec major and the anterior fibres of Deltoid work closely together. Pec-fly and push-up exercises work the Pectoralis major.

  • Origin: Medial 1/2 of the clavicle. Costal cartilages of the first 6 ribs. Sternum.
  • Insertion: Intertubercular groove (between the greater and lesser tubercles) of the humerus.
  • Actions: Shoulder flexion. Internal rotation. Adduction.
  • Innervation: Lateral and medial pectoral nerves.
  • Daily uses: Using roll-on deodorant.
  • Example strengthening exercises: Pec fly using a resistance band.
    Chest Press using a resistance band.
  • Example stretches –  Chest stretch. Chest stretch with a partner.
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