Postganglionic nerve fibers

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Postganglionic fibers
Sympathetic connections of the ciliary and superior cervical ganglia.
Latin neurofibrae postganglionicae
TA A14.2.00.010
FMA FMA:76569
Anatomical terms of neuroanatomy

In the autonomic nervous system, fibers from the ganglion to the effector organ are called postganglionic fibers.


The neurotransmitters of postganglionic fibers differ:

  • In the sympathetic division, neurons are mostly adrenergic (that is, epinephrine and norepinephrine function as the primary neurotransmitters.) Two exceptions to this rule are the sympathetic innervation of sweat glands and arrectores pilorum muscles where the neurotransmitter at both pre and post ganglionic synapses is acetylcholine and the vessels in the renal cortex where dopamine is used as the main neurotransmitter. Another exception is the sympathetic innervation of the medulla of the adrenal glands, which is accomplished by preganglionic fibers, and subsequently uses acetylcholine as a neurotransmitter. The cells of the adrenal medulla are actually modified postganglionic neurons which secrete epinephrine and norepinephrine directly into the blood stream rather than into a synapse.[1]

See also[edit]


  1. ^ Noback, Charles; David A. Ruggiero, Robert J. Demarest, Norman L. Strominger (2005). The Human Nervous System: Structure and Function (6th ed.). New Jersey: Humana Press. ISBN 978-1588290403. 

External links[edit]