Orthopaedics

Arms, Wrists, and Hands

The arms, wrists, and hands perform most of the active work of the upper body. The hand itself is made up of 19 bones. The small bones in the hand are known as the carpals, metacarpals, and phalanges. The wrist has 8 bones and the arms have three main bones: the upper arm bone (the humerus) and two lower ones named the radius and the ulna. The elbow joint is where the humerus joins the radius and the ulna. The arm also carries two important nerves—the ulnar and median nerves—that help to allow for movement and sensation the hands.

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