Generality
The vagus nerve, or pneumogastric nerve, is one of the twelve cranial nerves of the human being, to be precise the tenth.
Present in pairs (or pairs), the cranial nerves are fundamental nerve structures that arise at the level of the brain and can have a sensory or motor function or both (therefore mixed).
From the site: neurowiki2013.wikidot.com
The vagus nerve is the main representative of the nerve fibers that make up the parasympathetic nervous system: according to some studies, it constitutes about 75% of the latter.
Inside the human body, it travels a long way: from its birth in the medulla oblongata, it crosses the jugular hole, passes through the neck, descends into the chest and, from here, reaches the abdomen.
In its course towards the abdomen, it establishes numerous innervations: with the external auditory canal, with the trachea, with the stomach, with the lungs, with the stomach, with the intestine, etc.
The functions performed are obviously parasympathetic.
