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Encyclopedia > Infraspinatus muscle

The Infraspinatus muscle is a lateral rotator of the glenohumeral joint.


It attaches medially to the infraspinous fossa of the scapula and laterally to the greater tubercle of the humerus Left scapula - front view () Left scapula - rear view () In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone). ... The humerus is an long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ...


  Results from FactBites:
 
eMedicine - Infraspinatus Syndrome : Article Excerpt by Jonathan C Reeser (1420 words)
Infraspinatus syndrome is defined as a condition of frequently painless atrophy of the infraspinatus muscle caused by suprascapular neuropathy.
In its initial course, the SSN courses posterior and parallel to the inferior belly of the omohyoid muscle and anterior to the trapezius muscle in the posterior triangle of the neck.
The supraspinatus and infraspinatus muscles are part of the rotator cuff, which dynamically stabilizes the shoulder joint through a precise system of force couples and agonist-antagonist coactivation, keeping the humeral head centered in the glenoid socket.
Infraspinatus muscle - Wikipedia, the free encyclopedia (283 words)
The Infraspinatus muscle is a lateral rotator of the glenohumeral joint and adductor of the arm.
The Infraspinatus is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa; it arises by fleshy fibers from its medial two-thirds, and by tendinous fibers from the ridges on its surface; it also arises from the infraspinatous fascia which covers it, and separates it from the Teretes major and minor.
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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