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Hand Muscles

...  Muscles To start a motion, the major extrinsic muscles must coordinate the movement. The anterior muscles, flexi carpi ulnaris and the flexi carpi radialis flex the wrist, whereas the three posterior muscles, the extensor carpi radialis, extensor carpi radialis brevis and extensor carpi ulnaris extend the wrist. You can move your wrist sideward, forward and backward because of these  ...