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

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

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

Answer: (B)

The pinky-side bone of the forearm is the ulna. In the usual anatomical position, the forearm bones lie parallel with the palm facing forward: the ulna sits on the medial (toward the body's midline) side, which is the pinky side, while the radius is on the lateral (thumb) side. The humerus is the upper-arm bone, and the carpals are the wrist bones, not the forearm bones. The ulna is the bone that interfaces with the elbow and with the radius at the proximal and distal radioulnar joints, and when the forearm rotates (pronation), the radius moves around the stationary ulna.

The pinky-side bone of the forearm is the ulna. In the usual anatomical position, the forearm bones lie parallel with the palm facing forward: the ulna sits on the medial (toward the body's midline) side, which is the pinky side, while the radius is on the lateral (thumb) side. The humerus is the upper-arm bone, and the carpals are the wrist bones, not the forearm bones. The ulna is the bone that interfaces with the elbow and with the radius at the proximal and distal radioulnar joints, and when the forearm rotates (pronation), the radius moves around the stationary ulna.