• Pectoralis major
  • Pectoralis minor
  • Subclavius

MuscleActionOriginInsertionInnervationBlood supply
Pectoralis major- Adduction humerus
- Medial rotation humerus
- Flexion of the humerus
- Medial 1/2 of clavicle
- Anterior surface of sternum
- Costal cartilages 1-7
- Aponeurosis of external oblique
- Proximal humerus (lateral intertubercular groove)- Medial and lateral pectoral nerves- Pectoral branch of the thoracoacromial trunk
Subclavius- Stabilises sternoclavicular joint (via medial pull on clavicle)- Costal cartilage of 1st rib-Inferiomedial clavicle- Nerve to sub-clavius- Pectoral branch of the thoracoacromial trunk
Pectoralis minor- Depresses shoulder
- Protracts scapula
- Anteromedial surfaces of ribs 3-5
- Coracoid process of scapula- Medial pectoral nerves- Clavicular branch of thoracoacromial trunk