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Extensor carpi radialis brevis muscle

Synonym: short radial hand extensor
German: Musculus extensor carpi radialis brevis

1 Definition

The extensor carpi radialis brevis muscle belongs to the radialgroup of the forearm extensors.

2 Devolution

The muscle has its origin at the lateral epicondyle of the humerus. Above, it is overlapped by the extensor carpi radialis longus muscle. The muscle is narrowing around the middle of the forearm to a flat tendon that takes a distal course in close communion with the tendon of the beforesaid muscle. In its further course, the tendon passes below the abductor pollicis longus muscle and the extensor pollicis brevis muscle to the wrist, and passes the 2nd tendon compartment of the extensor retinaculum. The tendineous insertion of the extensor carpi radialis brevis muscle is the base of the 3rd metacarpal bone.

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3 Innervation

The innervation of the extensor carpi radialis brevis is provided by the profound branch of the radial nerve from the brachial plexus (segments: C7-C8).

4 Function

The extensor carpi radialis brevis muscle effects flexion in the elbow joint, extension of the hand in the wrist (extension or dorsal flexion), as well as a slight abduction of the hand in direction of the radius.

5 Clinical presentation

In the so-called "tennis elbow", the insertion of the muscle is painful upon pressure.

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