The superior oblique muscle is supplied by: (A) 3rd cranial nerve, (B) 4th cranial nerve, (C) 5th cranial nerve, (D) 6th cranial nerve
Answer is B. Superior oblique muscle is supplied by fouh cranial nerve i.e,trochlear nerve. It supplies only the superior oblique muscle of the eyeball. Superior oblique muscle helps in depression,abduction and intoion. Note: When trochlear nerve is damaged, diplopia occur looking downwards; vision is single so long as the eye look above the horizontal plane. Ref:BDC 6th edition of no.208