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Extensor carpi ulnaris muscle: Wikis


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Extensor carpi ulnaris
Extensor carpi ulnaris labeled at center right.
Latin musculus extensor carpi ulnaris
Gray's subject #125 454
Origin Common extensor tendon (lateral epicondyle), ulna
Insertion    5th metacarpal
Artery ulnar artery
Nerve the posterior interosseus nerve, a branch of the radial nerve
Actions extends and adducts the wrist
Antagonist Flexor carpi ulnaris

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.


Origin and insertion

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.

Additional images

External links



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