Origin | Infraspinous fossa of the scapula |
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Insertion | Middle facet of greater tubercle of the humerus |
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Action(s) | It is an external rotator of the glenohumeral joint and adductor of the arm. The Infraspinatus and Teres minor rotate the head of the humerus outward (external rotation); they also assist in carrying the arm backward. Studies by Lastayo, w., etc. have shown the infraspinatus to be the major external rotator of the shoulder in comparison with the teres minor. |
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Nerve Supply | Suprascapular nerve |
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Arterial Supply | Suprascapular and circumflex scapular arteries |
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Physical Exam | Enter physical examination maneuvers for muscle |
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Clinical Importance | Enter clinical importance of muscle |
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Disease States | Enter links to pages where muscle involved |
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Discussion | The tendon of this muscle is sometimes separated from the capsule of the shoulder-joint by a bursa, which may communicate with the joint cavity. |
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