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Infraspinatus is one of the rotator cuff muscles. It sits on the back of the scapula, below the spine of the scapula, filling the infraspinous fossa, and inserts onto the greater tubercle of the humerus.

Its main job is external rotation of the shoulder, but it also helps with compression of the humeral head into the glenoid during shoulder movement. So it is not just an “external rotator” in a simplistic sense. It contributes to shoulder control during reaching, lifting, throwing, and any movement where the arm has to stay centred in the socket while larger muscles do the bigger job.

Innervation is from the suprascapular nerve, mainly C5–C6.

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