This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
All the following nuclei are seen on the floor of fouh ventricle except 
Select and explain. 
A. Facial nucleus, B. Dorsal vagal nuclei, C. Hypoglossal nucleus, D. Abducens nucleus
A: Facial nucleus
Answer: A: Facial nucleus 
Explanation: Facial nuclei are not seen on the floor of fouh ventricle. Cranial nerve nuclei underneath the floor of 4the ventricle are: Abducent nucleus Vestibular nuclei Hypoglossal nucleus Dorsal nucleus of Vagus Nuclei of 9 and 11 cranial nerves (Ref: Vishram Singh textbook of clinical neuroanatomy, second edition pg 122, also refer table 10.3)