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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
[edit on Wikidata]
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.
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the glossopharyngeal nerve that innervates the ipsilateral parotid gland. Origin and central course The preganglionicnervefibers originate in the inferior...
is the longest nerve of the autonomic nervous system in the human body and comprises both sensory and motor fibers. The sensory fibers originate from...
from the zygomatic nerve to the lacrimal nerve of cranial nerve V. The remaining preganglionicfibers continue as the mixed facial nerve proper as it extends...
cranial nerve VI (abducens nerve) and anterior to cranial nerve VIII (vestibulocochlear nerve). The facial nerve also supplies preganglionic parasympathetic...
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enable most movements of the eye and that raise the eyelid. The nerve also contains fibers that innervate the intrinsic eye muscles that enable pupillary...
hypogastric plexus, where the preganglionicnervefibers synapse with the postganglionic sympathetic neurons, whose fibers ascend to the superior hypogastric...
and central neurons. Nervefibers are classed into three types – group A nervefibers, group B nervefibers, and group C nervefibers. Groups A and B are...
information, the sympathetic nervous system sends a signal to preganglionicnervefibers, which activate the adrenal medulla through acetylcholine. Once...
the face. It also carries parasympathetic preganglionicfibers (sphenopalatine) and postganglionic fibers (zygomatic, greater and lesser palatine and...
the autonomic nervous system, fibers from the central nervous system to the ganglia are known as preganglionicfibers, while those from the ganglia to...
sympathetic trunk. Once the preganglionicnerve has traversed a white ramus communicans, it can do one of three things. The preganglionic neuron can synapse with...
contain preganglionic sympathetic fibers and general visceral afferent fibers. There are three main thoracic splanchnic nerves. Greater splanchnic nerve, seen...
the preganglionic neurons, which synapse with postganglionic neurons in these locations: parasympathetic ganglia of the head: ciliary (cranial nerve III)...
Postganglionic nervefibers from the deep petrosal nerve join with preganglionicnervefibers from the greater petrosal nerve to form the nerve of the pterygoid...
part of the facial nerve) through the greater petrosal nerve. In the pterygopalatine ganglion, the preganglionic parasympathetic fibers from the greater...
lower motor neurons. The axons from the lower motor neurons are efferent nervefibers that carry signals from the spinal cord to the effectors. Types of lower...
unmyelinated preganglionic sympathetic fibers, (GVE and GVA). The white ramus appears white because there are more myelinated than unmyelinated fibers unlike...
levels L1-L2). Sympathetic fibers are the most numerous fibers in the hypogastric nerves. Preganglionic parasympathetic fibers that originate from pelvic...
rectum. They contain both preganglionic parasympathetic fibers as well as visceral afferent fibers. Visceral afferent fibers go to spinal cord following...
the first rib, and into the armpit, it supplies afferent and efferent nervefibers to the chest, shoulder, arm, forearm, and hand. The brachial plexus is...
intermedius. Motor fibers are carried via the facial nerve proper. The greater petrosal nerve, which carries preganglionic parasympathetic fibers, emerges from...
types of nervefibers. Proprioceptors are innervated by type Ia, Ib and II sensory fibers, mechanoreceptors by type II and III sensory fibers, and nociceptors...
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motor fibers of the vagus nerve (CN X) terminating in the laryngeal, pharyngeal muscles, and musculus uvulae; as well as to the efferent motor fibers of...
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