Neurotransmitter

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Related to neurotransmissions: Synaptic transmission

neurotransmitter

 [noor″o-trans´mit-er]
a substance (e.g., norepinephrine, acetylcholine, dopamine) that is released from the axon terminal of a presynaptic neuron on excitation, and that travels across the synaptic cleft to either excite or inhibit the target cell.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

neu·ro·trans·mit·ter

(nū'rō-trans'mit-ĕr),
Any specific chemical agent (including acetylcholine, five amines, four amino acids, two purines, and more than 28 peptides) released by a presynaptic cell, on excitation, that crosses the synapse to stimulate or inhibit the postsynaptic cell. More than one may be released at any given synapse. The neurotransmitters released by presynaptic cells may modulate transmitter release from presynaptic cells. Nitric oxide may be a retrograde neurotransmitter, released from postsynaptic cells, to act on presynaptic cells.
[neuro- + L. transmitto, to send across]
Farlex Partner Medical Dictionary © Farlex 2012

neurotransmitter

(no͝or′ō-trăns′mĭt-ər, -trănz′-, nyo͝or′-)
n.
A chemical substance, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

neurotransmitter

Neurosynaptic transmitter Physiology Any of a number of small neuroregulating molecules–eg, catecholamines and acetylcholine, which are synthesized in the presynaptic terminals of neurons, stored in vesicles, and cause rapid and transient depolarization near their point of release in the synaptic cleft, where it stimulates production of either excitatory or inhibitory postsynaptic potentials; neurotransmission at synapses or neuromuscular junctions is due to binding of a neurotransmitter to its cognate receptor. See Amino acid neurotransmitter, Neuropeptide, Neuroregulator. Cf Hormone.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

neu·ro·trans·mit·ter

(nūr'ō-trans'mit-ĕr)
Any specific chemical agent released by a presynaptic cell, on excitation, which crosses the synapse to stimulate or inhibit the postsynaptic cell.
[neuro- + L. transmitto, to send across]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

neurotransmitter

See TRANSMITTER SUBSTANCE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Neurotransmitter

A chemical in the brain that transmits messages between neurons, or nerve cells. Changes in the levels of certain neurotransmitters, such as serotonin, norepinephrine, and dopamine, are thought to be related to bipolar disorder.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

neurotransmitter

A substance stored in the synaptic vesicles that is released when the axon terminal is excited by a nervous impulse. The substance then travels across the synaptic cleft to either excite or inhibit another neuron. This is accomplished by either decreasing the negativity of postsynaptic potentials (excitation), or increasing the negativity of postsynaptic potentials (inhibition). Common neurotransmitters include acetylcholine, dopamine, endorphins, adrenaline (epinephrine), gamma-aminobutyric acid (GABA), amino acids, such as glutamate and glycine, noradrenaline (norepinephrine), serotonin and substance P. Common neurotransmitters in the retina are glutamate (the primary excitatory neurotransmitter), GABA (inhibitory), glycine (inhibitory), dopamine (excitatory) and acetylcholine (excitatory). See neuron; synapse.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

neu·ro·trans·mit·ter

(nūr'ō-trans'mit-ĕr)
Any specific chemical agent released by a presynaptic cell that, on excitation, crosses synapse to stimulate or inhibit the postsynaptic cell.
[neuro- + L. transmitto, to send across]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
In our study, neonatal propofol exposure induced long-term effect on GABAergic neurotransmission, and propofol increased the frequency of mIPSCs, slowed the decay time, and increased area of charge.
Interaction of glutamatergic and gamma-aminobutyric acid's neurotransmission in neonatal propofol exposure
The study of network of interplay between glutamatergic and GABAergic neurotransmission has been recently emphasized.
Effect of bumetanide on gamma-aminobutyric acid's neurotransmission, following neonatal propofol exposure
In the present study, we found that neonatal propofol exposure enhanced long-term GABAergic neurotransmission. Normally, a precise balance of excitatory and inhibitory synaptic inputs is essential for the proper function of a neuronal circuit, and the increase of GABAergic neurotransmission is involved in the loss of learning and memory.
Bessis, "Microglia activation triggers astrocyte-mediated modulation of excitatory neurotransmission," Proceedings of the National Academy of Sciences of the United States of America, vol.