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image: Infraspinatus


 Articulations :

 Action :

  • Laterally rotates arm;
  • helps to hold humeral head in glenoid cavity of scapula

Origin :

  • Infraspinous fossa of scapula.

Insertion :

  • Middle facet on greater tuberosity of humerus.

Innervation :

  • Suprascapular nerve (C5 and C6)

Arterial Supply :

  • Suprascapular and circumflex scapular arteries

Depth :

  • Deep
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