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Extrasomatic spikes recorded from cat motoneurons. Possible dendritic spikes
Y Fujita1, M Saito, K Kobayashi
1Department of Physiology, Nippon Medical School, Tokyo, Japan.
Nihon Ika Daigaku Zasshi
|August 1, 1997
Summary
Researchers recorded extrasomatic (ES-) spikes in cat motoneurons, observing multiple spike types from single sites. These findings suggest that ES-spikes originate from dendrites, not axons or initial segments.
Area of Science:
- Neurophysiology
- Cellular Neuroscience
Background:
- Motoneurons generate electrical signals crucial for muscle control.
- Understanding the origin of different spike types is essential for deciphering neuronal function.
Purpose of the Study:
- To investigate the origin of extrasomatic (ES-) spikes recorded in cat motoneurons.
- To differentiate ES-spikes from other neuronal action potentials.
Main Methods:
- Recording of ES-spikes in anesthetized and immobilized cats.
- Stimulation of L7 or S1 ventral roots with a train of pulses.
- Analysis of spike responses at single recording sites.
Main Results:
- ES-spikes, with amplitudes of 40-79 mV, were recorded.
- Distinct responses to ventral root stimulation differentiated ES-spikes from intrasomatic spikes.
- Multiple (3-6) different spike types were observed at the same site in 23 motoneurons.
Conclusions:
- The observation of numerous spike types at a single site challenges explanations based on axon or initial segment spikes.
- The findings strongly suggest that ES-spikes are of dendritic origin in motoneurons.