The bottom of the humerus joins with the top of the radius and ulna bones of the lower alrm to form the elbow joint. The meeting of these bones allows for the wide range of motion that is possible ...

Included in the package are six well-preserved arm and leg bones, each of which is labeled. There is one radius (R1) and one ulna (U1); these are the two bones that connect the wrist and elbow.