| Infraspinatus muscle | |
|---|---|
 Muscles connecting the upper extremity to the vertebral column (posterior view). | |
 Infraspinatus muscle (shown in red) seen from behind. | |
| Details | |
| Origin | Infraspinous fossa of the scapula |
| Insertion | Middle facet of greater tubercle of the humerus |
| Artery | Suprascapular and circumflex scapular arteries |
| Nerve | Suprascapular nerve |
| Actions | External rotation of arm and stabilization of glenohumeral joint |
| Identifiers | |
| Latin | musculus infraspinatus |
| TA98 | A04.6.02.008 |
| TA2 | 2458 |
| FMA | 32546 |
| Anatomical terms of muscle | |
In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa.[1] As one of the four muscles of the rotator cuff, the main function of the infraspinatus is to externally rotate the humerus and stabilize the shoulder joint.
- ^ Gray's Anatomy, see infobox.