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The Infraspinatus muscle is one of the four rotator cuff muscles crossing the shoulder joint and is commonly injured. It is the main external rotator of the shoulder joint.
- Posterior surface of the scapula (below the spine of the scapula).
- Greater tuberosity on the humerus.
- Shoulder abduction
- External rotation.
- Suprascapular nerve.
- Brushing hair.