Completar frases Parasympathetic nervous systemVersión en línea unit 2 por Kirsten Storemski 1 preganglionic facial parasympathetic vagus brain reciprocal internal muscarinic oculomotor smooth relaxation postganglionic glossopharyngeal sacrum glands nicotinic The system innervates most but not all organs . The PaNS fibers arise from the stem , cranial nerves ( CNIII ) , ( CNVII ) , ( CNIX ) , and ( CNX ) , as well as the 2 , 3 , and 4 . The neurotransmitter secreted by two PaNS neurons and the type of receptors are ACH where the receptors are . The second is ACH where receptors are . The action of the PaNS is whole body , secretion by , contraction of muscles of internal organs . PaNS and SNS are .