<prompt> 75 contribution to parasympathetic system is by which cranial nerve -OculomotorFacialGlossopharyngealVagus  <response>: Ans. is D i.e., Vagus Vagus nerve contains almost 75 of all parasympathetic nerve fibers - Clinical anatomy About 75 of all parasympathetic nerve fibers are in vagus nerve - Millers Anesthesia 