| Autor: |
J.J. Callec, J.P. Coillot, J.C. Guillet, J. Bernard |
| Rok vydání: |
1980 |
| Předmět: |
|
| Zdroj: |
Journal of Insect Physiology. 26:755-762 |
| ISSN: |
0022-1910 |
| DOI: |
10.1016/0022-1910(80)90089-x |
| Popis: |
A study of the negative phase of the spikes recorded extra cellularly from insect mechanoreceptor has been performed in order to characterize some electrical properties of the dendrite which contains the transducing part of the sensory neuron. These properties have been investigated in mechanoreceptors of the metathoracic leg of the locust Schistocerca gregaria by firing antidromic action potentials both at rest and during mechanical or electrical stimulation. The amplitude of the negative phase of the spike appears to be correlated with the polarization of the dendritic membrane, although when bursts of action potentials are applied, the relation is more complex, including a depressive influence of a given spike on the following spike. The receptor potential and the antidromic dendritic spikes both originate in the same region of the dendrite but they involve different ionic processes. Our results indicate that the dendrite is electrically excitable. The spike which originates in the dendrite has an initial negative phase with a small superimposed positive component. A spike of this shape is never observed under natural stimulation. It is proposed that the negative phase of the antidromic impulse provides a suitable means for studying the variations in electrical polarization of the dendrite which cannot be recorded directly. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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