Superficial layer
Pronator teres
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It is a very small, feeble and vestigeal muscle situated along the medial face of the elbow joint, closely blended with the medial lateral ligament.
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Origin: Medial epicondyle of the humerus.
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Insertion: Upper part of the medial border of the radius.
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Action: Inappreciable as it is vestigeal.
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Nerve supply: Median nerve.
Flexor carpi radialis (Medial flexor of the carpus)
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This is a narrow muscle placed immediately behind the preceding.
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Origin: Medial epicondyle of the humerus. The tendon is provided with a synovial sheath above the carpus.
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Insertion: A tubercle on the postero-medial part of the upper extremity of the large metacarpal bone.
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Action: To flex the carpus and extend the elbow.
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Nerve supply: Median nerve
Flexor carpi ulnaris (Middle flexor of the carpus)
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This is a wide muscle situated behind the preceding and covers the medial surface of the forearm.
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Origin: Has two heads of origin - humeral head from the medial epicondyle of the humerus and ulnar head from the medial face of the olecranon.
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Insertion: The supero-medial half of the accessory carpal bone.
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Action: To flex the carpus and extend the elbow.
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Nerve supply: Ulnar nerve.
Ulnaris lateralis (Flexor metacarpi externus)
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It is a large, thick muscle situated behind the lateral digital extensor.
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Origin: Lateral epicondyle of the humerus.
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Insertion: By a short thick tendon to the supero-lateral half to the carpal bone and by a narrow long tendon to the lateral aspect of the upper extremity of the large metacarpal.
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Action: To flex the carpus and extend the elbow.
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Nerve supply: Radial nerve.
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Last modified: Thursday, 13 October 2011, 11:30 AM