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Review Question - QID 217998

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QID 217998 (Type "217998" in App Search)
A 61-year-old female presents to your office with complaints of right shoulder pain which has worsened over the last year. She denies any distinct injury. On examination, she has full active and passive range of motion with 5/5 strength on empty can testing and a negative Hawkins test. O'Brien's and Speed's tests cause pain. An MRI is obtained and demonstrates intra-substance tearing of the biceps tendon in addition to a SLAP lesion. Subluxation of the biceps tendon is also seen. What is the innervation of the associated structure most likely to also be injured?