Extensor Carpi Radialis Brevis

Extensor Carpi Radialis Brevis and the extensor carpi radialis longus act to extend the wrist and abduct the hand at the wrist joint.

The distal attachment site of the extensor carpi radialis brevis muscle is the base of the third metacarpal. The extensor carpi radialis brevis and longus tendons are common sites for synovial (ganglion) cysts.