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Anatomy
A 22-year-old pregnant woman was admitted emergently to the hospital after the baby had begun to appear at the introitus. The baby had presented in the breech position, and it had been necessary to exert considerable traction to complete the delivery and the newborn is shown. Which of the following structures was most likely injured by the trauma of childbirth?
Radial nerve
Upper trunk of the brachial plexus
Lower trunk of the brachial plexus
Median, ulnar, and radial nerves
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