Preganglionic nerve fibers: Difference between revisions
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{{Short description|Nerve fibers connecting the central nervous system to a ganglion}} |
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{{more citations needed|date=November 2014}} |
{{more citations needed|date=November 2014}} |
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{{Infobox nerve |
{{Infobox nerve |
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| Name = Preganglionic nerve fibers |
| Name = Preganglionic nerve fibers |
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In the [[autonomic nervous system]], |
In the [[autonomic nervous system]], [[nerve fiber]]s from the [[central nervous system]] to the [[autonomic ganglion|ganglion]] are known as '''preganglionic nerve fibers'''. All preganglionic fibers, whether they are in the [[sympathetic nervous system|sympathetic division]] or in the [[parasympathetic nervous system|parasympathetic division]], are [[cholinergic]] (that is, these fibers use [[acetylcholine]] as their [[neurotransmitter]]) and they are [[myelin]]ated. |
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[[Sympathetic nervous system|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 nervous system|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 preganglionic fibers with ganglionic neurons. |
[[Sympathetic nervous system|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 nervous system|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 preganglionic fibers with ganglionic neurons. |
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==See also== |
==See also== |
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* [[Nerve fiber]] |
* [[Nerve fiber]] |
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* [[Grey column]] |
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* [[Terminal cisterna]] |
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* [[Rexed lamina]] |
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* [[Splanchnic nerve]] |
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* [[Lateral grey column]] |
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==References== |
==References== |
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Latest revision as of 01:12, 4 September 2024
 | This article needs additional citations for verification. (November 2014) |
| Preganglionic nerve fibers | |
|---|---|
 Autonomic nervous system innervation, showing the sympathetic and parasympathetic (craniosacral) systems, in red and blue, respectively | |
| Details | |
| Identifiers | |
| Latin | neurofibrae preganglionicae |
| TA98 | A14.2.00.009 |
| FMA | 76568 |
| Anatomical terms of neuroanatomy | |
In the autonomic nervous system, nerve fibers from the central nervous system to the ganglion are known as preganglionic nerve 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) and they are myelinated.
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. 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 preganglionic fibers with ganglionic neurons.
See also
[edit]- Nerve fiber
- Grey column
- Terminal cisterna
- Rexed lamina
- Postganglionic nerve fiber
- Splanchnic nerve
- Lateral grey column
References
[edit]External links
[edit]
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