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10874 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?

ARadial nerve
BUpper trunk of the brachial plexus
CLower trunk of the brachial plexus
DMedian, ulnar, and radial nerves
Anatomy
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