Broken arms are common and can result from falls, accidents, or sports injuries. Your arm is made up of three main bones. The humerus is the long bone in the upper arm that extends from your ...

There is one radius (R1) and one ulna (U1); these are the two bones that connect the wrist and elbow. There are two humerus bones (H1 and H2). The humerus connects the shoulder and the elbow.