10-27-09 - Muscles of the Forearm - Posterior Supinator O:...

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Muscles of the Forearm - Posterior Supinator
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O: Common extensor tendon – lateral epicondyle of the humerus I: spirals around and inserts on the anterior radius N: Radial A: Elbow - flexion
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Forearm - supination
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Muscles of the Forearm - Posterior Extensor indicis
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O: Posterior distal ulna below the origin of the extensor pollicis longus and interosseous membrane I: Middle phalanx of index finger N: Radial A: Forearm – supination Wrist – extension and radial deviation Finger - ** index finger – MP, PIP, and DIP extension
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Muscles of the Forearm - Posterior Extensor pollicis longus
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O: Middle third of the posterior ulna distal to the abductor pollicis longus and interosseous membrane I: Base of the distal phalanx of the thumb posteriorly N: Radial A: Forearm - supination Wrist – extension, radial deviation Thumb – carpometacarpal (CMC), metacarpal phalangeal (MP) and interphalangeal (IP) extension Comment: ** Snuff box ; The anatomical snuff box consists of the extensor pollicis longus on the medial side and the extensor pollicis brevis on the lateral side – make sure to define
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anatomical position to determine medial and lateral Muscles of the Forearm - Posterior Extensor pollicis brevis
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O: ** Posterior radius distal to the origin of the abductor pollicis longus and interosseous membrane I: Base of the proximal phalanx of the thumb N: Radial A: **NO SUPINATION – because doesn’t cross over from radius to ulna Wrist – extension and radial deviation Thumb – CMC and MP extension
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Comment: ** The extensor pollicis brevis does NOT supinate the forearm while the extensor pollicis longus does Muscles of the Forearm - Posterior Abductor pollicis longus
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O: Posterior ulna , distal to the insertion of the anconeus, middle third of the posterior radius, and interosseous membrane I: ** Base of the 1 st MC radial side N: Radial A: * Forearm supination **Wrist flexion and radial deviation Thumb – CMC abduction and extension
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Pronation Prime Movers
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Pronator teres Pronator quadrates
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Supination Prime Movers
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Supinator
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Pronation MMT
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GR – sitting, elbow bent to 90° and tucked into the side . Although this is not a GR position, it is used because the weight of
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This note was uploaded on 02/11/2010 for the course AHS 234 taught by Professor Bial during the Fall '09 term at Nassau CC.

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10-27-09 - Muscles of the Forearm - Posterior Supinator O:...

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