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.
Insertion : Intertubercular groove (between the greater and lesser tubercles) of the humerus.
Actions : Shoulder flexion.
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.