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

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Multiple Choice

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

Explanation:
In the forearm, there are two long bones: the radius and the ulna. In the standard anatomical position, with the palms facing forward, the radius is on the thumb side (the lateral side) and is the outer bone of the forearm. The ulna sits on the opposite side (medial, toward the little finger). The humerus is the upper arm bone, and the tibia is a leg bone, so they’re not part of the forearm. So the bone described is the radius.

In the forearm, there are two long bones: the radius and the ulna. In the standard anatomical position, with the palms facing forward, the radius is on the thumb side (the lateral side) and is the outer bone of the forearm. The ulna sits on the opposite side (medial, toward the little finger). The humerus is the upper arm bone, and the tibia is a leg bone, so they’re not part of the forearm. So the bone described is the radius.

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