Over 90% of all parasympathetic fibers are derived from cranial nerves v (trigeminal) vii (facial) x (vagus) xii (hypoglossal)

Over 90% of all parasympathetic fibers are derived from the cranial nerve X, which is the vagus nerve. 
The vagus nerve influences most organs below the neck. The activation of this nerve affects heart rate, blood pressure, production of stomach acid, movement of food through the intestines and breathing. 

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It feels feed the echo system