• Source: Preganglionic nerve fibers

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


Nerve fiber
Grey column
Terminal cisterna
Rexed lamina
Postganglionic nerve fiber
Splanchnic nerve
Lateral grey column




References






External links


Diagram at uwaterloo.ca

Kata Kunci Pencarian:

• Preganglionic nerve fibers
• Postganglionic nerve fibers
• Group B nerve fiber
• Glossopharyngeal nerve
• Vagus nerve
• Splanchnic nerves
• Intermediate nerve
• Oculomotor nerve
• Facial nerve
• Parasympathetic nervous system