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Review Question - QID 213983

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QID 213983 (Type "213983" in App Search)
A 28-year-old male triathlete presents to your office for evaluation of numbness and weakness in his right hand, which began 5 weeks ago following a charity race. On exam, he has paresthesias to his volar small finger and ulnar half of his ring finger, difficulty crossing his index and middle fingers, and a weakened grip. Dorsal hand sensation is normal, as is the sensation to the volar aspect of the forearm. Froment’s sign is present. An EMG is most likely to demonstrate fibrillations in which of the following muscles?