Major Muscles and Actions Involved
In ulna flexion (hand adduction) the flexor carpi ulnaris and the extensor carpi ulnaris muscles are involved. In this action the little finger side of the hand moves toward the forearm. In radial flexion (hand abduction), the flexor carpi radialis and the extensor carpi radialis longus and brevis are involved. In this action the thumb side of the hand moves toward the forearm.
Ulna flexion is the key action in the wrist break in baseball and softball batting, the golf swing, the slice tennis serve, and fly casting. It is a key action in Frisbee throwing and is used in the racquet sports when you try to impart spin to the ball (bird) in the forehand and backhand strokes. In baseball pitching it is used when throwing sinking balls, and in softball pitching it is needed for imparting side spin to the ball. Radial flexion and the muscles involved are not very important in most sports. However, they are most important in the wrist action in the discus throw and Frisbee throws.
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