The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form and runs parallel to the radius, which is shorter and smaller. In anatomical position (i.e. when the palms of the hands face forward) the ulna is located at the side of the forearm closest to the body (the medial side), the side of the little finger. The corresponding bone in the leg is the fibula.
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