Review Question - QID 109178

A 72-year-old man presents to his primary care physician due to worsening headache and double vision. His headache began several months ago, and he describes them as sharp and localized to the left side of the head. His double vision began one week prior to presentation. Medical history is significant for hypertension and type II diabetes mellitus, which is treated with lisinopril and metformin. He smokes a pack of cigarettes a day for the last 40 years. His temperature is 98.3°F (37°C), blood pressure is 148/84 mmHg, pulse is 60/min, and respirations are 14/min. On physical exam, a mild head turning towards the left is appreciated. Pupils are equal, round, and reactive to light, with a more pronounced esotropia on left-lateral gaze. The rest of the neurologic exam is otherwise normal. Magnetic resonance imaging (MRI) of the head and MR angiography shows a left-sided intracavernous carotid aneurysm. Which of the following nerves is most likely compressed by the aneurysm in this patient?