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arm
The part of the human forelimb between the wrist and the shoulder The upper arm bone (humerus is attached at the shoulder by a ball-and-socket joint and to the lower arm by a hinge joint at the elbow The lower arm consists of the ulna and radius, which rotates over the ulna to turn the wrist. The chief arm muscles arm the biceps and the triceps and the strong hand muscles.
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• ANATOMY AND PHYSIOLOGY
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