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Oh blimmey! That's a whole new thread of itself!
The nerve gets its name from the Latin word for wandering, according to Merriam-Webster, which is appropriate, as the vagus nerve is the largest and most widely branching cranial nerve.
By wandering and branching throughout the body, the vagus nerve provides the primary control for the nervous system's parasympathetic division: the rest-and-digest counterpoint to the sympathetic nervous system's fight-or-flight response. When the body is not under stress, the vagus nerve sends commands that slow heart and breathing rates and increase digestion. In times of stress, control shifts to the sympathetic system, which produces the opposite effect.
It is known as the wandering nerve because, in layman's terms, when it 'miss-fires' it will send or not send signals to the afore mentioned organs of the body.
oppfamilychiropractic.com...
The Vagus nerve is the longest cranial nerve and is so named for the Latin word “wanderer”. The Vagus nerve wanders like a vagabond, sending out nerve fibers from the brain, down the neck, and then passes around the digestive system, liver, spleen, pancreas, heart, and lungs.