The vagus nerve is the 10th cranial nerve, or the Wandering Nerve (vagus is Latin for wandering), extending from the brain stem all the way to the viscera with a number of branching nerves to the heart, lungs, voice box, stomach, and ears, among other organs. It contains motor and sensory fibers and, because it passes through the neck and thorax to the abdomen, has the widest distribution in the body. Because it is so important, it is often referred to as the neural superhighway.
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The vagus nerve comes down from the brain on both sides of the neck and is connected to all of the organs in the trunk of the body.