Pectoralis major is the largest and most superficial of the two chest muscles. Pec major and the anterior fibers 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

Shoulder Joint Muscles:

Innervation

  • Lateral and medial pectoral nerves

Daily uses

  • Using roll-on deoderant

How can I stretch it?

How can I strengthen it?

More Human Muscles: