06/03/2026
The vagus nerve, the longest nerve in the body, originates in the brainstem and extends down into the abdomen. It monitors and receives information about the functioning of the heart, lungs, and other internal organs so that you can focus attention on other matters.
It is the duty of the vagus nerve to orchestrate bodily responses to keep you safe or warn you about danger before you even have a chance to think about it. Without your awareness, the brain scans the environment for cues of danger, pitching you into high alert to fight or flee or, in extreme situations, shutting you down. It also scans for cues of safety, which allow you enough calm to open you up to socially engage with others.
The vagus nerve, the longest nerve in the body, originates in the brainstem and extends down into the abdomen. It monitors and receives information about the functioning of the heart, lungs, and other internal organs so that you can focus attention on other matters.