The thumb possesses a unique and wide range of motion not shared by the hand’s other digits. Not only does it bend its knuckle, but the tip of the thumb can touch the tips of the fingers.
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Fingers have a complex anatomy. Each finger has 3 phalanges (bones) and 3 hinged joints; the thumb has two of each. Ligaments connect finger bones and help keep them in place. Tendons connect muscles to bones.