page_title: Infraspinatus muscle
hierarchical_section_title: Infraspinatus muscle
caption_attribution_description: English: Infraspinatus muscle (shown in red). 日本語: 棘下筋。赤色で示す。
context_page_description: In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. 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.
context_section_description: In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa.  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.
caption: Infraspinatus muscle (shown in red) seen from behind.
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