THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The ulna is one of the two forearm bones and is on the small finger side of the forearm. Unlike the radius, this bone does not twist, so when the hand changes position, the ulna is always in the same position on the inside part of the forearm. Like the radius, the ulna has joints at the elbow and wrist.

Detailed explanation-2: -The radius is the forearm bone that extends from the inside of the elbow to the thumb side of the wrist – and is situated laterally to the ulna, which is larger in both size and length. The upper end of the radius is small and creates only a portion of the elbow joint.

Detailed explanation-3: -In the anatomical position, the radius is found in the lateral forearm, while the ulna is found in the medial forearm. The radius is shorter than the ulna and has a small proximal end that articulates with the humerus, and a broad distal end that articulates with the carpal bones at the wrist.