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Home > Anatomy & Physiology > Muscles > Pectoralis major chest muscle

Pectoralis Major Chest 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 deoderant

How can I stretch it?

How can I strengthen it?

Pectoralis major




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