<prompt> True about vagal nuclei are all except?There are 4 vagal nucleiThey are found in the floor of 4th ventricleNucleus Ambiguous is a vagal nucleusSpinal trigeminal nucleus is not a vagal nucleus  <response>: Ans. isdi.e., Spinal trigeminal nucleus is not a vagal nucleusRef: Functional and chemical anatomy of the afferent vagal system. Autonomic Neuroscience. 85 I-3: I-17.The vagus nerve includes axons which emerge from or converge onto four nuclei of the medulla.They are present deep in the medulla in the floor of the 4th ventricle. 