• Teres minor
  • Infraspinatus
  • Deltoid
MuscleActionOriginInsertionInnervationBlood supply
Teres minor- Lateral rotation of arm
- assists in stabilisation of glenohumeral joint
- Superolateral portion of scapula border- Greater tubercle of humerus (inferior facet)- Axillary nerve: C5,6- Subscapular and circumflex scapular arteries
Infraspinatus- Lateral rotation of the humerus
- assists in stabilisation of the glenohumeral joint
- Dorsal surface of scapula (below the spine of the scapula)- Greater tubercle of humerus (middle facet)- Suprascapular nerve: C4,5,6- Suprascapular and circumflex scapular arteries
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