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A 23-year-old woman comes to the physician because of sudden severe pain over the base of the terminal phalanx of the index finger. Two days ago, she was making a bed in a hotel and caught the end of the index finger in a fold as she straightened the sheet. Physical examination shows the right index finger is swollen and she is unable to completely extend the DIP joint. Which one of the following structures within the digit was most likely injured?

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