Extensor carpi radialis brevis

Humerus at the anterior of lateral epicondyle (common extensor tendon)

Base of the 3rd metacarpal

It is an extensor, and an abductor of the hand at the wrist joint. That is, it serves to manipulate the wrist so that the hand moves away from the palm and towards the thumb. The muscle, like all extensors of the forearm, can be strengthened by exercise that resist its extension. A wrist roller can be used and reverse wrist curls with dumbbells can performed.

Deep branch of the radial nerve

Radial artery

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Antagonist: Flexor carpi radialis muscle