Nerve: Preganglionic fibers
Autonomic nervous system innervation, showing the sympathetic and parasympathetic (craniosacral) systems, in red and blue, respectively
Latin	neurofibrae preganglionicae
Gray's	subject #185 758

In the autonomic nervous system, fibers from the CNS to the ganglion are known as preganglionic fibers.

All preganglionic fibers, whether they are in the sympathetic division or in the parasympathetic division, are cholinergic (that is, these fibers use acetylcholine as their neurotransmitter).

Sympathetic preganglionic fibers tend to be shorter than parasympathetic preganglionic fibers because sympathetic ganglia are often closer to the spinal cord than are the parasympathetic ganglia.

[edit] See also

• Postganglionic fibers

[edit] External links

• Diagram at tmc.edu
• Diagram at bham.ac.uk
• Diagram at uwaterloo.ca

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