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Topics | Brain and Nervous System | Healthy Nervous System | Functions of Nerves | What does the vagus nerve do? The vagus nerve provides a speedy line of information to the brain from the gut, where battles with bacteria and viruses are continually raging. Knowledge of the vagus's role was a mystery until very recently, but we now know that you can learn about your body from your vagus. The longest nerve directly from the brain, the vagus sends messages to and receives messages from your gut and every other organ in your body. Because 85 percent of this huge nerve carries information back to the brain, it's the main mechanism by which your brain audits your body. The remaining 15 percent takes information from your brain to your body.
The vagus nerve is the paired tenth cranial nerve that branches out from the brain and supplies parts of the gastrointestinal system such as the stomach, and parts of the respiratory system such as the lungs. To supply vital organs, it has further to travel than the other cranial nerves.he vagus nerve innervates critical organs, such as the heart and lungs, making vagus nerve disorders serious. The symptoms of vagus nerve disorder can include cardiac, gastrointestinal, and sensory problems. slide 1 of 4.