Sub-miniature junction potentials in excitatory neuromuscular synapses of the locust
| Autor: | Chr. Walther, K. Hensler, J.P. Hodgkiss |
|---|---|
| Rok vydání: | 1982 |
| Předmět: |
Synaptic potential
biology Muscles General Neuroscience Neuromuscular Junction Motor nerve Grasshoppers Neurotransmission medicine.disease_cause biology.organism_classification Motor Endplate Synaptic Transmission Electric Stimulation Neuromuscular junction Jumping medicine.anatomical_structure Synapses medicine Excitatory postsynaptic potential Animals Calcium Muscle fibre Neuroscience Locust |
| Zdroj: | Neuroscience Letters. 34:27-32 |
| ISSN: | 0304-3940 |
| DOI: | 10.1016/0304-3940(82)90087-8 |
| Popis: | By recording miniature excitatory junction potentials (mejps) intracellularly at two points from a multiterminally innervated muscle fibre it is possible to select mejps whose amplitudes are not substantially affected by electrotonic decay. Many amplitude histograms of such selected mejps from untreated locust jumping muscle show a bimodal distribution with a high proportion of small-amplitude mejps (sub-mejps). Most amplitudes of excitatory junction potentials (ejps) resulting from the release of a single transmitter quantum correspond to the large-mode mejps. Tetanic nerve stimulation, in high [Mg2+]o without Ca2+, greatly reduces the proportion of sub-mejps. It is concluded that there are two modes of spontaneous transmitter release from the motor nerve endings. |
| Databáze: | OpenAIRE |
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