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M. extensor carpi ulnaris
with a head on the humerus and a two-headed superficial extensor(dorsiflexor) of the wrist attached to the ulna.
Origin:
- Caput humerale: Epicondylus lateralis humeri
- Caput ulnare: Olecranon
Attachment: Base of Os metacarpale V
Antagonists:
Movement: Ulnar abduction and dorsiflexion of the wrist; extension of the elbow joint