The extensor carpi radialis brevis is specific human muscle. It is an extensor, and an abductor of the hand at the wristjoint.
It lies medial to longus, and is slightly shorter. It starts lower down on the humerus at the lateral epicondyle, and inserts into the base of the 3rd metacarpal.
Like all the muscles in the posterior forearm, ECR brevis is supplied by a branch of the radial nerve.
Extensorcarpiradialislongus is one of the five main muscles that control movement at the wrist.
As the name suggests, this muscle is an extensor at the wrist joint, and travels along the radial side of the arm, so will also abduct the hand at the wrist.
Being an extensor contained in the forearm, it is innervated by the radial nerve.
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