In the autonomic nervous system,<unk>  from the CNS to the ganglion are known as<unk><unk> . All<unk><unk> , whether they are in the sympathetic division or in the parasympathetic division, are cholinergic (that is, these<unk>  use acetylcholine as their neurotransmitter) and they are myelinated. Sympathetic<unk><unk>  tend to be shorter than parasympathetic<unk><unk>  because sympathetic ganglia are often closer to the spinal cord than are the parasympathetic ganglia. Another major difference between the two ANS (autonomic nervous systems) is divergence. Whereas in the parasympathetic division there is a divergence factor of roughly 1:4, in the sympathetic division there can be a divergence of up to 1:20. This is due to the number of synapses formed by the<unk><unk>  with ganglionic neurons.
Preganglionic nerve fibers
Postganglionic nerve fibers
Efferent nerve fiber
Special visceral afferent fiber
Parasympathetic nervous system
Special somatic afferent fiber
Secondary sensory endings
Muscle spindle