Structures

  • Trapezius
  • Latissimus dorsi
  • Levator scapulae
  • Rhomboid major
  • Rhomboid minor

MuscleActionOriginInsertionInnervationBlood supply
Trapezius- Upper fibres: Elevation of scapula
Rotation of scapula during humerus abduction
- Middle fibres: Retract the scapula
- Lower fibres: Depress the scapula
- Superior nuchal line
- External occipital protuberance
- Ligamentum nuchae
- Spinous processes of C7-T12
- Lateral 1/3 of clavicle
- Acromion
- Spine of scapula
- Motor: accessory nerve (XI)
- Proprioception: C3,4
- Transverse cervical artery
Latissimus dorsi- Extends humerus
- 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
Levator scapulae- Elevates scapula- Transverse processes of C1-4- Upper portion medial border of scapula- Dorsal scapular nerve: C4,C5- Dorsal scapula artery
Rhomboid major- Retracts scapula
- Elevates scapula
- Spinous processes of T2-5- Medial border of scapula: between spine and inferior angle- Dorsal scapular nerve: C4,C5- Dorsal scapula artery
Rhomboid minor- Retracts scapula
- Elevates scapula
- Ligamentum nuchae
- Spinous processes of C7,TI
- Medial border of scapula: at the spine of scapula- Dorsal scapular nerve: C4,C5- Dorsal scapula artery