Arm internal rotation
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Internal or medial rotation of the arm represents the movement of the humerus when an arm flexed to 90° at the elbow is internally rotated around the longitudinal plane of the humerus such that the hand moves towards the midline of the body.
The degree of rotation is dependant on the degree of abduction at the shoulder. In adduction internal rotation can be up to 70°. As the arm is abducted this increases towards 95°. It is the opposite of arm external rotation.
It is produced by:
- subscapularis
- latissimus dorsi
- teres major
- deltoid (anterior fibres)
See also movements of the arm.
-<p><strong>Internal or medial rotation</strong> of the arm represents the movement of the <a title="Humerus" href="/articles/humerus">humerus</a> when an <a title="Arm" href="/articles/arm">arm</a> flexed to 90° at the <a title="Elbow" href="/articles/elbow">elbow</a> is rotated around the longitudinal plane of the humerus such that the <a title="Hand (anatomy)" href="/articles/hands">hand</a> moves towards the midline of the body. </p><p>The degree of rotation is dependant on the degree of <a title="arm abduction" href="/articles/arm-abduction">abduction</a> at the shoulder. In adduction internal rotation can be up to 70°. As the arm is abducted this increases towards 95°. It is the opposite of arm <a title="arm external rotation" href="/articles/arm-external-rotation">external rotation</a>.</p><p>It is produced by:</p><ul>- +<p><strong>Internal or medial rotation</strong> of the <a title="Arm" href="/articles/arm">arm</a> represents the movement of the <a href="/articles/humerus">humerus</a> when an <a href="/articles/arm">arm</a> flexed to 90° at the <a href="/articles/elbow">elbow</a> is internally rotated around the longitudinal plane of the humerus such that the <a href="/articles/hands">hand</a> moves towards the midline of the body. </p><p>The degree of rotation is dependant on the degree of <a href="/articles/arm-abduction">abduction</a> at the shoulder. In adduction internal rotation can be up to 70°. As the arm is abducted this increases towards 95°. It is the opposite of arm <a href="/articles/arm-external-rotation">external rotation</a>.</p><p>It is produced by:</p><ul>
References changed:
- 1. Last's anatomy, regional and applied. Churchill Livingstone. ISBN:044304662X. <a href="http://books.google.com/books?vid=ISBN044304662X">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/044304662X">Find it at Amazon</a><span class="auto"></span>
- 2. Susan Standring. Gray's Anatomy. <a href="https://books.google.co.uk/books?vid=ISBN9780702052309">ISBN: 9780702052309</a><span class="ref_v4"></span>
- 3. Moore KL, Agur AMR, Dalley AF. Clinically oriented anatomy. LWW. ISBN:1451119453. <a href="http://books.google.com/books?vid=ISBN1451119453">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/1451119453">Find it at Amazon</a><span class="auto"></span>
Sections changed:
- Anatomy
Systems changed:
- Musculoskeletal
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Arm internal rotation
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arm medial rotation
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