The term 'bone arm' refers to the bones in the arm that make up the skeletal structure of the upper limb. The ULNA (4 letters) is a long bone located on the medial side of the forearm, and the RADIUS (6 letters) is a bone located on the lateral side of the forearm. The humerus (7 letters) is the bone in the upper arm that connects the shoulder to the ELBOW. The ulnar (5 letters) nerve runs along the ULNA and is responsible for sensation in the hand. The ELBOW (5 letters) is the joint between the humerus and the two forearm bones, the ULNA and the RADIUS.