Supraspinatus

• O (origin)

  • Medial 2/3 of the supraspinous fossa

  A) Supraspinatus

  
• R (direction)

  • Laterally

  A) Supraspinatus

  
• I (insertion)

  • Tendon forms within the muscle as it passes laterally below trapezius, the acromion process and the coracoacromial ligament
  • Tendon blends in with superior aspect of the glenohumeral joint capsule
  • Inserts into upper facet on the greater tubercle of humerus

  A) Supraspinatus

  
• A (actions)

  • Initiates abduction of glenohumeral joint

  A) Supraspinatus

  
• NS (nerve supply)

  • Suprascapular nerve (C4 - C6)

  A) Supraspinatus

  
• Supraspinatus:

  • Located on posterior aspect of scapula above the spine of scapula, deep to trapezius

  
• Supraspinatus - Function:

  • Holds the head of humerus against the glenoid fossa to prevent upward shearing

  A) Supraspinatus