This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Which of the following is not true about the Trochlear nerve? 
Select and explain. 
A. Has the longest intracranial course, B. Supplies the ipsilateral superior oblique muscle, C. Only cranial nerve that arise from the dorsal aspect of the brainstem, D. Enters orbit through the superior orbital fissure outside the annulus of Zinn
A: Has the longest intracranial course
Answer: A: Has the longest intracranial course 
Explanation: 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