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

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Multiple Choice

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

Explanation:
In the forearm, the bone on the thumb side is the radius. In anatomical position, the radius is on the lateral (thumb) side and the ulna is on the medial (pinky) side. They run parallel when the palm faces forward (supination) and cross over each other during rotation (pronation). The radius also reaches to the wrist to form part of the radiocarpal joint. The scaphoid is a wrist bone (one of the carpal bones) near the base of the thumb, not a forearm bone, and the iliac is part of the pelvis, not the forearm.

In the forearm, the bone on the thumb side is the radius. In anatomical position, the radius is on the lateral (thumb) side and the ulna is on the medial (pinky) side. They run parallel when the palm faces forward (supination) and cross over each other during rotation (pronation). The radius also reaches to the wrist to form part of the radiocarpal joint. The scaphoid is a wrist bone (one of the carpal bones) near the base of the thumb, not a forearm bone, and the iliac is part of the pelvis, not the forearm.

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