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Review Question - QID 9090

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QID 9090 (Type "9090" in App Search)
A 32-year-old male presents with left shoulder pain and weakness. He reports sustaining a forced external rotation injury to his left upper extremity during a recreational football game 3 months ago. The decision is made to proceed with arthroscopic treatment of his injury. Video V shows the view from the posterosuperior portal. The structure highlighted by the black comma is innervated by a nerve(s) that branch off which anatomic structure of the brachial plexus?
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