Structures

  • Coracobrachialis
  • Pectoralis major
  • Latissimus dorsi
  • Teres major
MuscleActionOriginInsertionInnervationBlood supply
Coracobrachialis- Assists in Flexion of shoulder- Coracoid process- Medial midshaft humerus- Musculocutaneous nerve- Brachial artery
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
Latissimus dorsi- Extends humerus
- Depress scapula
- Adducts humerus
- Medially rotates humerus
- Spinous processes of T7-L5
- Sacrum
- Iliac crest
- Ribs 10-12
- Biccipital groove of humerus-Thoracodorsal nerve: C6-8- Thoracodorsal branch of subscapular artery
Teres Major- Adduction of humerus
- Medial rotation of humerus
- Extension of humerus
- Inferior angle of scapula- Medial portion of intertubercular groove of humerus- Lower subscapular nerve: C5,6,7- Sub scapular artery
- Cicumflex scapular artery