(See also: Rotator cuff) 
- origin: infraspinatus fossa of scapula
- insertion: posterior aspect of greater tuberosity of humerus, capsule of shoulder joint;
- demensions: infraspinatus has been shown to average 29 mm wide, with a mean medial-to-lateral width of 19 mm
- action: extension, horizontal extension and lateral rotation of humerus at the shoulder joint.
- the infraspinatus is the primary muscle force resposible for external rotation;
- reversed origin insertion action: with the arm fixed, abducts the inferior angle of the scapula;
- synergists: Teres Minor, Subscapularis, Deltoid;
- nerve supply: suprascapular, C5, C6
- Isolated Rhabdomyolysis of the Infraspinatus Muscle Following the CrossFit “Sissy Test”: A Report of Two Cases
- The role of the supraspinatus and infraspinatus muscles in glenohumeral kinematics of anterior should instability.
- Changes in the moment arms of the rotator cuff and deltoid muscles with abduction and rotation.
- Isolated paralysis of the infraspinatus muscle.
- Suprascapular neuropathy in volleyball players.
- Suprascapular nerve injuries with isolated paralysis of the infraspinatus.
- Infraspinatus Delamination Does Not Affect Supraspinatus Tear Repair.