This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Orbit, Subject name: Anatomy
A patient Rasmu presents with eye deviated laterally and slightly downward. The upward gaze is impaired and medial rotation is not possible. Which nerve is involved. 
Select and explain. 
A. III, B. IV, C. VI, D. All
A: III
Answer: A: III 
Explanation: Ans. is 'a' i.e. III C.N Muscular supply of Extraocular musclesAll muscular of the eye are supplied by the III C.N except the superior oblique (by IV C.N ) & Lateral rectus (by VI C.N).Paralysis of III C.N would spare the sup. Oblique and the lateral rectus and the unopposed action would pull the eye outwards & downwardsAction of Superior oblique- downwards & laterallyAction of Lateral rectus - laterally