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There are three, the humerus which is the upper bone from the shoulder to the elbow, then there are two bones between the elbow and wrist called the radius and ulna. When you extent you arm to shake hands with someone, the radius is the bone on top.
The arm is the part of the upper limb that goes from the shoulder to the elbow joints and its only bone is the humerus. The resot of the upper limb has the radius and ulna in the forearm, the carpals in the writs, the metacarpals in the palms and the phallangess in the digits.
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7y ago

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