The vagus nerve is the main nerve of the parasympathetic system, connecting the brain to organs like the heart and gut, controlling involuntary functions like digestion and heart rate, and playing roles in mood and stress response; its damage causes issues like gastroparesis (slow stomach emptying) and vasovagal syncope (fainting), while Vagus Nerve Stimulation (VNS) helps treat conditions like epilepsy and depression by calming the body.
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