Why postganglionic neurons myelination and preiganglionic neurons is not ? in both we need fast condect .

Axons & dendrites: A neuron's axon transmits an electro-chemical signal to other neurons, sometimes over a long distance. Myelin is the sausage-like fatty sheath around an axon. Electrical impulses reach the end of an axon, & trigger the release of chemicals that cross the synapse to the dendrite branches, triggering the flow of ions into or out of a nerve cell. See you tube www.Flashbrainanatomy.Com/.