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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 two nerves that go through the brain stem and enter different parts of the body such as the heart and the stomach. Vagus nerve leaves the brain stem from the rootlets present in the medulla that has been found to be caudal to the rootlets in the ninth carnial nerve.The vagus nerve comprises of two sensory ganglia which are segmented into superior and inferior vagal ganglia. It can cause problems in the digestion of food in the stomach as it helps in peristalsis of the stomach. 2  Vagus nerve disorders can occur when there is pressure on the vagus nerve or due to other stimulation. 3  Sometimes people lose the vagus nerve in a cancer surgery.