Extensor carpi ulnaris muscle

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Extensor carpi ulnaris is a muscle located in the human forearm that acts to extend and adduct the wrist.

Being an extensor muscle, extensor carpi ulnaris is on the posterior side of the forearm.

It originates from the lateral epicondyle of the humerus and the posterior border of the ulna, and crosses the forearm to the ulnar (medial) side to insert at the base of the 5th metacarpal.

The Extensor carpi ulnaris extends the wrist, but when acting alone inclines the hand toward the ulnar side; by its continued action it extends the elbow-joint.

The muscle is a minor extensor of the carpus in carnivores, but has become a flexor in ungulates. In this case it is described as ulnaris lateralis.

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  Bones of left forearm. Posterior aspect.
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  Bones of the left hand. Dorsal surface.
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  Cross-section through the middle of the forearm.
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  Posterior surface of the forearm. Deep muscles.
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  Transverse section across distal ends of radius and ulna.
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  Transverse section across the wrist and digits.
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  The mucous sheaths of the tendons on the back of the wrist.

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