Which bone is the thumb-side forearm bone?

Which bone is the thumb-side forearm bone?

• A. Ulna
• B. Radius
• C. Carpals
• D. Humerus

Answer: (B)

In the forearm, the two long bones are the radius and the ulna. The bone on the thumb side when the palm faces forward is the radius. The ulna sits on the opposite side, by the pinky. The radius is the lateral forearm bone and forms part of the wrist on the thumb side (you can feel its influence in the radial pulse at the wrist). Carpals are the small wrist bones, and the humerus is the bone of the upper arm, not the forearm.

In the forearm, the two long bones are the radius and the ulna. The bone on the thumb side when the palm faces forward is the radius. The ulna sits on the opposite side, by the pinky. The radius is the lateral forearm bone and forms part of the wrist on the thumb side (you can feel its influence in the radial pulse at the wrist). Carpals are the small wrist bones, and the humerus is the bone of the upper arm, not the forearm.