Which bone is located on the thumb side of the forearm?

Which bone is located on the thumb side of the forearm?

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

Answer: (B)

In anatomical terms, the forearm has two long bones, and the one on the thumb side is the radius. In the standard position (standing with arms at the sides and palms facing forward), the radius is the lateral bone closest to the thumb, while the ulna lies on the opposite, pinky side. The radius also forms part of the wrist joint by connecting with the carpal bones and it rotates around the ulna during forearm pronation and supination. The other options are not forearm bones: carpals are the wrist bones, and phalanges are the finger bones.

In anatomical terms, the forearm has two long bones, and the one on the thumb side is the radius. In the standard position (standing with arms at the sides and palms facing forward), the radius is the lateral bone closest to the thumb, while the ulna lies on the opposite, pinky side. The radius also forms part of the wrist joint by connecting with the carpal bones and it rotates around the ulna during forearm pronation and supination. The other options are not forearm bones: carpals are the wrist bones, and phalanges are the finger bones.