Structures

  • Pectoralis major
  • Deltoid
  • Biceps brachii
  • Coracobrachialis
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
Deltoid- Anterior fibres: Flexion of arm
- Middle fibres: abduction of arm
- Posterior fibres: Extension of arm
- clavicle
- Acromion process
- Spine of scapula
- Deltoid tuberosity- Axillary nerve: C5,6- Deltoid branch of thoracoacromial artery
Biceps Brachii - Flexion of elbow
- Supination of forearm
- Short head: Coracoid process
- Long head: Supraglenoid Fossa
- Radial tuberosity- Musculocutaneous nerve- Brachial artery
Coracobrachialis- Assists in Flexion of shoulder- Coracoid process- Medial midshaft humerus- Musculocutaneous nerve- Brachial artery