• Supraspinatus
  • Deltoid
MuscleActionOriginInsertionInnervationBlood supply
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
Supraspinatus- Initiates and assists in shoulder abduction
- assists in stabilisation of glenohumeral joint
- Supraspinous fossa of scapula- Greater tubercle of humerus (superior facet)- Suprascapular nerve: C4,3,6- Suprascapular artery