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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.
Some are psychological, i.e. the fear response causes them to faint, or physical, such as the fainting that occurs when we over exert ourselves. Vagal nerve fainting (also known as vasovagal syncope) is quite simply any loss of consciousness caused by the vagus nerve. The vagus nerve runs directly from the brain stem, in front of the ears and down the neck towards the chest and abdomen. It branches off in several places to provide communication with the brain to a number of organs, such as the heart and the stomach.