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The Extensor Carpi Radialis Brevis is in the Superficial Layer of the Posterior Compartment of the forearm. It is also a member of the Wrist Extensor Group; the muscles of the wrist extensor group are:
- Extensor carpi radialis longus
- Extensor carpi radialis brevis
- Extensor carpi ulnaris
- Lateral epicondyle of the humerus via the common extensor belly/tendon to the radial side of the posterior hand.
- The distal attachment is onto the posterior side of the base of the third metacarpal.
- Extends the hand at the wrist joint.
- Radially deviates the hand at the wrist joint.
- Flexes the forearm at the elbow joint.
- The extensor carpi radialis brevis is also a member of the Radial Group of forearm muscles (along with the brachioradialis and extensor carpi radialis longus).
- The extensor carpi radialis brevis is often involved with lateral elbow tendinopathy (aka tennis elbow).
- The extensor carpi radialis brevis crosses the elbow joint anteriorly so it flexes the elbow joint, but crosses the wrist joint posteriorly so it extends the wrist joint.