Neurotransmitter

neurotransmitter /neu·ro·trans·mit·ter/ (-tranz´mit-er) a substance released from the axon terminal of a presynaptic neuron on excitation, which diffuses across the synaptic cleft to either excite or inhibit the target cell.

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false neurotransmitter  an amine that can be stored in and released from presynaptic vesicles but that has little effect on postsynaptic receptors.

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neu·ro·trans·mit·ter (nr-trnzmt-r, -trns-)

n.

Any of the various chemical substances, such as acetylcholine, that transmit nerve impulses across a synapse.

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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.

Mentioned in: Adrenergic Blockers, Antidepressant Drugs, SSRI, Bipolar Disorder, Botulism, Central Nervous System Depressants, Club Drugs, Cocaine, Erectile Dysfunction, Intermittent Explosive Disorder, Lesch-Nyhan Syndrome, Lysergic Acid Diethylamide, Monoamine Oxidase Inhibitors, Mood Disorders, Neuroendocrine Tumors, Pain Management, Peripheral Neuropathy, Phototherapy, Premenstrual Syndrome, Tourette Syndrome, Weight Loss Drugs

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neurotransmitter (nerˈ·ō·transˑ·mi·ter),

n chemical messenger that modifies or affects communication across synapses or neuromuscular connections. Important neurotransmitters include dopamine, serotonin, and acetylcholine.

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neurotransmitter,

n any one of numerous chemicals that modify or result in the transmission of nerve impulses between synapses. Neurotransmitters are released from synaptic knobs into synaptic clefts and bridge the gap between presynaptic and postsynaptic neurons.

Neuron.

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neurotransmitter

a substance (e.g. norepinephrine, acetylcholine, dopamine) that is released from the axon terminal of a presynaptic neuron on excitation, and which travels across the synaptic cleft to either excite or inhibit the target cell.

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adrenergic neurotransmitter

see norepinephrine.

neurotransmitter receptor

each neurotransmitter has its own receptor molecule; these show a high degree of structural homology.