Some science behind the scenes
The vagus nerve also called cranial nerve X, is the tenth of twelve paired cranial nerves. The vagus is also called the pneumogastric nerve since it innervates both the lungs and the stomach.
Upon leaving the medulla, it extends through the jugular foramen, then passing into the carotid sheath between the internal carotid artery and the internal jugular vein down below the head, to the neck, chest and abdomen, where it contributes to the innervation of the viscera. The medieval Latin word vagus means literally "Wandering" and this is exactly what it does – wander all over the body.
Besides output to the various organs in the body, the vagus nerve conveys sensory information about the state of the body's organs to the central nervous system. 80-90% of the nerve fibers in the vagus nerve are sensory nerves communicating the state of the viscera to the brain.
But what is key here is that the vagus nerve conyrols the parasympatheric nervous system. The vagus nerve supplies motor parasympathetic fibers to all the organs except the adrenal glands, from the neck down to the second segment of the transverse colon.
Zone therapy – Dr William Fitzgerald
When Professor Robert Fitzsimmons delivered the famous punch in the solar plexus that laid the mighty James Corbett upon whatever it is they cover a boxing ring with, he demonstrated to everybody's satisfaction – except perhaps Mr Corbett's – that there is a group of nerves in the pit of the stomach which has an intimate and most distressful connection with the brain. And now every doctor knows the functions and connections of the pneumogastric nerve.
Activation of the vagus nerve typically leads to a reduction in heart rate, blood pressure, or both. Research has shown that women having had complete spinal cord injury can experience orgasms through the vagus nerve, which can go from the uterus, cervix, and, it is presumed, the vagina to the brain.
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