A 27-year-old man was brought to the emergency department after he was involved in a motor vehicle collision. An x-ray of the right shoulder shows a fracture of the lateral border of the scapula. Six weeks later, the patient comes to the physician because of pain and weakness in the right shoulder while performing his daily activities. Physical examination shows weakness and pain on medial rotation and adduction of the humerus. Which of the following nerves is most likely injured?

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