Rotator Cuff

The rotator cuff comprises four scapular muscles that stabilize the Glenohumeral Joint and move the 🦴 humerus.

Muscles

• Supraspinatus

  • Origin: Supraspinous fossa of the Scapula
  • Insertion: Superior facet of the greater tubercle of the 🦴 humerus
  • Action: Abducts the 🦴 humerus; stabilizes the Glenohumeral Joint

• Infraspinatus

  • Origin: Infraspinous fossa of the Scapula
  • Insertion: Middle facet of the greater tubercle of the 🦴 humerus
  • Action: Laterally rotates the 🦴 humerus; stabilizes the Glenohumeral Joint

• Teres Minor

  • Origin: Lateral border of the Scapula
  • Insertion: Inferior facet of the greater tubercle of the 🦴 humerus
  • Action: Laterally rotates and assists adduction of the 🦴 humerus; stabilizes the Glenohumeral Joint

• Subscapularis

  • Origin: Subscapular fossa (anterior Scapula)
  • Insertion: Lesser tubercle of the 🦴 humerus
  • Action: Medially rotates and adducts the 🦴 humerus; stabilizes the Glenohumeral Joint

References

• Humerus