<prompt> All the following nuclei are seen on the floor of fouh ventricle exceptFacial nucleusDorsal vagal nucleiHypoglossal nucleusAbducens nucleus  <response>: 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 