Rotator Cuff Muscles

Rotator Cuff Muscles

1. TERES MINOR

   • ORIGIN: Dorsal surface/axillary (lateral) border of scapula
   • INSERTION: Greater Tubercle of Humerus
   • ACTION: Lateral (external) rotation of Humerus

2. SUPRASPINATUS

   • ORIGIN: Supraspinatus fossa of scapula
   • INSERTION: Greater Tubercle of Humerus
   • ACTION: ABduction of shoulder (humerus); stabilizes shoulder joint

3. INFRASPINATUS

   • ORIGIN: Infraspinatous fossa of scapula
   • INSERTION: Greater Tubercle of Humerus
   • ACTION: Lateral Rotation of shoulder (humerus); Horizontal ADduction of humerus (shoulder)

4. SUBSCAPULARIS

   • ORIGIN: Subscapular Fossa
   • Insertion: Lesser Tubercle of Humerus
   • ACTION: Medial (Internal) Rotation of humerus: stabilizes shoulder & Lateral (external) rotation of humerus