Origin

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

Insertion

Base of the 3rd metacarpal

Action(s)

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.

Nerve Supply

Deep branch of the radial nerve

Arterial Supply

Radial artery

Physical Exam

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Clinical Importance

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Disease States

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Discussion

Antagonist: Flexor carpi radialis muscle

Figures

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Credits:

From Wikipedia:
Extensor carpi radialis brevis muscle

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