The vagus nerve is a critical nerve that connects your brain to nearly every major organ in your body. It earned its nickname as the body’s “ultimate power line” because it regulates vital functions like heart rate, digestion, and respiratory rate, influencing both physical and emotional well-being hoolest.com . Its Latin name, meaning “wandering,” reflects how it weaves throughout your entire system, carrying signals that help your body respond to stress, maintain balance, and promote overall health.