The vagus nerve, or wandering nerve, is the longest cranial nerve in the body and is a part of the parasympathetic nervous system. It originates from the brain stem, runs through the neck and chest, and into your abdomen, branching off to different organs.
The wandering nerve is responsible for regulating the parasympathetic nervous system. This system (PNS) is one of two autonomic nervous system (ANS) parts.
The PNS is responsible for restoring essential functions and soothing the body. In comparison, the sympathetic nervous system (SNS) is responsible for the fight or flight response.
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