system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 30-year-old man presents with weakness in his right hand. He says he has been an avid cyclist since the age of 20. He denies any recent trauma. Physical examination reveals decreased sensations over the 4th and 5th digits with difficulty extending the 4th and 5th phalanges. Strength is 4 out of 5 in the extensor muscles of the right hand and wrist. When the patient is asked to extend his fingers, the result is shown in the image. Which of the following nerves is most likely damaged in this patient?
assistant
Ulnar nerve