Review Question - QID 108461

A 52-year-old female with a history of poorly-controlled diabetes presents to her primary care physician because of pain and tingling in her hands. These symptoms began several months ago and have been getting worse such that they interfere with her work as a secretary. She says that the pain is worse in the morning and she has been woken up at night by the pain. The tingling sensations have been located primarily in the thumb, index and middle fingers. On physical exam atrophy of the thenar eminence is observed and the pain is reproduced when the wrist is maximally flexed. The most likely cause of this patient's symptoms affects which of the nerves shown in the image provided?