Which bone runs along the pinky side of the forearm?

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

Answer: (A)

In anatomical position, the forearm contains two bones: the radius and the ulna. The radius sits on the thumb side (lateral), while the ulna runs on the pinky side (medial). So the bone that lies along the pinky side is the ulna. The humerus is the upper arm bone, and the fibula is a leg bone, not part of the forearm. The bones of the forearm are connected at the elbow and wrist, allowing the forearm to rotate (pronation and supination) around the radius and ulna.