from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Posterior or distal to a ganglion.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Located distal or posterior to a ganglion
from The Century Dictionary and Cyclopedia
- Noting the region behind or posterior to a ganglion, as nerve-fibers which are about to pass through a ganglion.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. beyond or distal to a ganglion (referring especially to the unmyelinated fibers that originate from cells in autonomic ganglia)
Sorry, no etymologies found.
These secretions are called postganglionic secretions). i) Suppression of Immune system, j) Vasoconstriction and increase in Blood Pressure, k) P u p i l dilation, (Illustration of an excited face with pupils dilated). l)
In writing the 1955 review on the "Pharmacology of vascular smooth muscle," I had become very interested in the mechanisms by which sympathetic postganglionic denervation and certain drugs like cocaine markedly potentiate the response of effector organs to epinephrine and norepinephrine, yet markedly reduce the response to the sympathomimetic tyramine.
Studies have shown that penile erection is achieved via postganglionic sympathetic adrenergic innervation in concert with parasympathetic neurons.
Acetylcholine, injected into the vessels of a ganglion, could be shown to stimulate the ganglion cells to the discharge of postganglionic impulses.
You will see that we are thus led to the conclusion that nearly all the efferent neurones of the whole peripheral nervous system are cholinergic; only the postganglionic fibres of the true sympathetic system are adrenergic, and not even all of these.
We must suppose that this sudden rise in concentration of acetylcholine stimulates the ganglion cell to the discharge of a postganglionic impulse, or initiates a propagated wave of excitation along the muscle fibre.
Gaddum23 have shown that stimulation of the preganglionic sympathetic fibres in the neck releases Ac.Ch. in the sup.cerv. ganglion, which itself stimulates the ganglion, so that progressive stimulation is set up in the postganglionic fibres.
The parasympathetic nerve fibers, on the contrary, travel to ganglia within the organ they are aiming at; as a result, the preganglionic fibers are quite long and the postganglionic fibers very short.
In some cases, the ganglia separating the preganglionic fibers from the postganglionic fibers are actually located within the organ the nerve is servicing.
The axons of these cell bodies form a second set of fibers, the postganglionic fibers.