Extensor carpi ulnaris

Common extensor tendon (lateral epicondyle), ulna

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.

The posterior interosseus nerve, a branch of the radial nerve

Ulnar artery

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Antagonist: Flexor carpi ulnaris