Anatomy of the Hand and Wrist: Bones, Muscles, Tendons, Nerves. The wrist links the hand to the arm. The wrist is a complex mechanical system of 8 small bones known as the carpal bones. The carpal bones are arranged in 2 interrelated rows. One row connects with the ends of the bones in the forearm— radius and ulna.
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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.