This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Eye, Nose and Ear, Subject name: Anatomy
Occulomotor nerve palsy causes all of the following EXCEPT 
Select and explain. 
A. Ptosis, B. Mydriasis, C. Upward and lateral detion of eyeball, D. Pupillary reflex lost
C: Upward and lateral detion of eyeball
Answer: C: Upward and lateral detion of eyeball 
Explanation: Upward & lateral detion of eyeball doesn't happen in oculomotor nerve palsy. Oculomotor nerve (CN III) innervates all EOM except: Superior oblique (CN IV) & lateral rectus (CN VI) Paralysis of CN III results in: Ptosis (due to LPS involvement) Lateral & downward detion of eye (LR & SO are the only muscles intact, unopposed action) Dilatation of pupil (paralysis of sphincter pupilae muscle) Loss of accommodation reflex (paralysis of ciliary muscles)