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M. extensor carpi radialis brevis

the short radial wrist extensorattached to the upper arm and covered by the extensor carpi radialis longus
Origin: Epicondylus lateralis humeri
Attachment: Os metacarpale III
Innervation: Nervus radialis from Plexus brachialis from C7-C8
Antagonists:
Movement: Dorsiflexion and slight radial abduction of the wrist, flexion of the elbow joint