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The best way for us to learn about the upper extremity is to begin at the very beginning, right up here. We'll start by looking at the bones of the shoulder region: the clavicle, the scapula and the humerus. Then we'll look at the joints, which let them move, and the muscles, which make them move. Lastly we'll look at the principal blood vessels and nerves in the region. First, the bones.