Written by Oliver Jones

Last updated October 9, 2022 • 4 Revisions •

The infraspinatus is an intrinsic muscle of the shoulder region. It is part of the rotator cuff muscle group.

  • Attachments: Originates from the infraspinous fossa of the scapula and attaches to the greater tubercle of the humerus.
  • Innervation: Suprascapular nerve.
  • Actions: Lateral rotation of the upper limb at the shoulder.
  • Blood supply: Suprascapular and circumflex scapular arteries

Fig 1
The rotator cuff muscles, which act to stabilise the shoulder joint.

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