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Review Question - QID 218061

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QID 218061 (Type "218061" in App Search)
A 28-year-old orthopedic resident is rock climbing on his post-call day. He lost his grip, slipped, and suffered a large laceration to the ulnar side of his proximal forearm. As an astute resident, he evaluates his wound and realizes that he has severed his ulnar nerve. He lacks sensation over the ulnar side of his hand. However, he is able to extend his thumb, flex his second interphalangeal joint, and abduct and adduct his fingers. What nerve anastomosis does he most likely have?