cranial nerves connect our brains to other systems in our body for primary functions. The Vagus Nerve is the largest of the 12 cranial nerves and is the main nerve in our parasympathetic nervous system, which regulates our digestion, heart rate, and immune system.
Our parasympathetic nervous system also controls our mood, how well we deal with stress, and our ability to get calm and stay calm. The Vagus Nerve is sometimes called the gut-brain axis because it has a bi-directional communication system between the brain and the gut.