A 65-year-old man comes to the office complaining of visual abnormalities. One day before the presentation, he started having double vision associated with left eyelid drooping. On examination, the patient has a left dilated pupil with no response to light or accommodation. Additionally, the left eye deviates inferolateral when the patient is asked to start straight. Magnetic resonance angiography shows a basilar artery aneurysm on the left side. Which of the following muscles would not be affected by this lesion?

Question

Quizplus · Accepted Answer

Eductional Objective: Oculomotor nerve palsy may result from external compression or ischemia in diabetic patients. Patients affected present with ptosis, inferolateral deviation of the eye, diplopia, and dilated pupils. Dilated pupils would present early in external compression as the parasympathetic fibers run on the outer side of the nerve. The oculomotor nerve supplies all ocular muscles except the lateral rectus and superior which are supplied by the abducens nerve and the trochlear nerve respectively.

A 65-Year-Old Man Comes to the Office Complaining of Visual