The vagus nerve carries an extensive range of signals from digestive system and organs to the brain and vice versa. It is the tenth cranial nerve, extending from its origin in the brainstem through the neck and the thorax down to the abdomen.
A super brief youtube video about vagus nerve within a person.
» https://youtu.be/a-NCs1lOU5w


References
Frontiers | Vagus Nerve as Modulator of the Brain–Gut Axishttps://www.frontiersin.org