<prompt> Which of the following is not true about the Trochlear nerve?Has the longest intracranial courseSupplies the ipsilateral superior oblique muscleOnly cranial nerve that arise from the dorsal aspect of the brainstemEnters orbit through the superior orbital fissure outside the annulus of Zinn  <response>: Trochlear nerve is the fouh cranial nerve. It supplies only superior oblique muscle. It is the only cranial nerve which emerges on the dorsal aspect of brainstem. This nerve enters the orbit through the lateral pa of superior orbital fissure. In orbit, it passes medially, above the origin of levator palpebrae superioris and ends by supplying the superior oblique muscle on its orbital surface. Ref BDC volume 3,sixth edition pg 364 