The forearm bone on the side closest to the little finger is called the ulna. Which of the following is the other forearm bone?

The forearm bone on the side closest to the little finger is called the ulna. Which of the following is the other forearm bone?

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

Answer: (C)

Two bones make up the forearm: the radius and the ulna. In the usual standing position, the ulna points along the pinky side of the forearm, while the radius runs along the thumb side. They are connected by an interosseous membrane and form the radioulnar joints that allow rotation of the forearm (pronation and supination). Since the question asks for the other forearm bone besides the ulna, the correct answer is the radius. The radius works with the humerus at the elbow and with the carpal bones at the wrist to enable wrist and forearm movements. The humerus is the upper arm bone, and the fibula is a leg bone.

Two bones make up the forearm: the radius and the ulna. In the usual standing position, the ulna points along the pinky side of the forearm, while the radius runs along the thumb side. They are connected by an interosseous membrane and form the radioulnar joints that allow rotation of the forearm (pronation and supination). Since the question asks for the other forearm bone besides the ulna, the correct answer is the radius. The radius works with the humerus at the elbow and with the carpal bones at the wrist to enable wrist and forearm movements. The humerus is the upper arm bone, and the fibula is a leg bone.