Trochlear nerve all true except:: (A) Longest intracranial course, (B) Arises from dorsum of brainstem, (C) Supply ipsilateral superior oblique muscle, (D) Enter orbit through sup.
Answer is C. C i.e. Supplies ipsilateral superior oblique muscle Trochlear nerve is thinnest nerve. It is the only nerve to emerge from dorsum of brain stemQ has longest intracranial course. It enters orbit through outer pa of superior orbital fissure (ie lateral to annulus of Zinn)Q and supplies superior oblique muscle. Because it's a crossed cranial nerve (with decussation in mid brain), the trochlear nerve nucleus supplies contralateral superior oblique muscle.