Long preganglionic fiber, short postganglionic fiber

Short preganglionic fiber, long postganglionic fiber

Short preganglionic fiber, short postganglionic fiber

Long preganglionic fiber, long postganglionic fiber

preganglionic uses acetylcholine; postganglionic uses acetylcholine

preganglionic uses norepinephrine; postganglionic uses acetylcholine

preganglionic uses norepinephrine; postganglionic uses norepinephrine.

preganglionic uses serotonin; postganglionic uses acetylcholine.

The parasympathetic system only has a preganglionic neuron, which uses acetylcholine as its neurotransmitter.