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The vagus nerve (/ËveÉªÉ¡És/ VAY-gÉs), historically cited as the pneumogastric nerve, is the tenth cranial nerve or CN X, and interfaces with parasympathetic control of the heart, lungs and digestive tract. The vagus nerves are paired; however, they are normally referred to in the singular.
The vagus nerve is the key instrument of the parasympathetic system. Beginning in the medulla oblongata, the nerve travels to all of the organs of the body sending signals to and from the brain. The two previous posts provide lots of information about the vagus nerve and how to activate the relaxation response.