منابع مشابه
Crustacean Phasic and Tonic Motor Neurons1
SYNOPSIS. Crustacean motor neurons subserving locomotion are specialized for the type of activity in which they normally participate. Neurons responsible for maintained activity (‘tonic’ neurons) support moderate to high frequencies of nerve impulses intermittently or continuously during locomotion, while those recruited for short-lasting rapid responses (‘phasic’ neurons) generally fire a few ...
متن کاملSynaptic structure and transmitter release in crustacean phasic and tonic motor neurons.
The paired phasic and tonic motor neurons supplying the extensor muscle in the crayfish leg were investigated to establish whether differences in synaptic structure could account for large differences in transmitter release at the neuromuscular junctions. Nerve terminals with transmitter release that had been assessed from recordings made with a focal "macro-patch" electrode were subsequently l...
متن کاملPhasic Transmitter Release from Tonic Neurons
Graded and prolonged presynaptic depolarizations trigger the tonic release of neurotransmitters from sensory neurons. In this issue of Neuron, Simmons reports that postsynaptic responses of locust interneuron synpapses are determined by the rate rather than the amplitude of presynaptic depolarization, suggesting a mechanism for increasing the signaling capabilities of this synapse with respect ...
متن کاملSynaptic physiology and mitochondrial function in crayfish tonic and phasic motor neurons.
Phasic and tonic motor neurons of crustaceans differ strikingly in their junctional synaptic physiology. Tonic neurons generally produce small excitatory postsynaptic potentials (EPSPs) that facilitate strongly as stimulation frequency is increased, and normally show no synaptic depression. In contrast, phasic neurons produce relatively large EPSPs with weak frequency facilitation and pronounce...
متن کاملSensitivity of transformed (phasic to tonic) motor neurons to the neuromodulator 5-HT.
Long-term adaptation resulting in a 'tonic-like' state can be induced in phasic motor neurons of the crayfish, Procambarus clarkii, by daily low-frequency stimulation [Lnenicka, G.A., Atwood, H.L., 1985b. Long-term facilitation and long-term adaptation at synapses of a crayfish phasic motoneuron. J. Neurobiol. 16, 97-110]. To test the hypothesis that motor neurons undergoing adaptation show inc...
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ژورنال
عنوان ژورنال: Integrative and Comparative Biology
سال: 2004
ISSN: 1540-7063,1557-7023
DOI: 10.1093/icb/44.1.4