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A 32-year-old woman is brought to the emergency department 1 hour after a motor vehicle collision. She is awake and alert upon arrival. Her temperature is 37°C (98.6°F), pulse is 90/min, respirations are 16/min, and blood pressure is 118/72 mm Hg. Physical examination shows tenderness and bruising over the left arm. Flexion and supination of the forearm are severely weakened and she has loss of sensation on the lateral surface of the forearm. An x-ray of the upper limb shows multiple fractures of the humerus. Which of the following nerves is most likely injured?
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