![]() ![]() Abductor pollicis longus: This forearm muscle helps pull the wrist and the thumb away from the body.Extensor retinaculum: Close to the flexor retinaculum, this ligament affects muscles that help extend fingers and other parts of the hand.It affects muscles that help flex the hand. Flexor retinaculum: This strong band of fibrous ligament (material that connects bone to bone) stretches across the back of the wrist.Approximately14 percent of the population do not have this tendon, but its absence has not been shown to detract from hand function. Palmaris longus: This is a slender triangle-shaped tendon, a fibrous band that connects muscles to bones, on the palm. ![]()
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