A 37-year old female presents to the clinic complaining of severe pain in her left wrist and tingling sensation in her left thumb, index finger, and middle finger, and some part of her ring finger. Hie pain started as an occasional throb and she could ignore it or take ibuprofen but now the pain is much worse and wakes her up at night. She works as a typist and her pain mostly increases alter typing all day. Her right wrist and fingers are line Nerve conduction studies reveal ncive compression. Which of the following nerves is most likely compressed in this patient?