What causes wrist extension?

Wrist extension is primarily caused by the contraction of the extensor muscles located in the forearm, particularly the extensor carpi radialis longus, extensor carpi radialis brevis, and extensor carpi ulnaris. These muscles work to pull the back of the hand and fingers upward, increasing the angle between the dorsal side of the hand and the forearm. This movement is often facilitated by the synergistic action of other muscles and tendons around the wrist joint. Additionally, wrist extension can be influenced by the positioning of the fingers and overall hand posture.