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.