Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Intracellular analysis of synaptic mechanisms controlling spontaneous and cortically induced rhythmical jaw movements in the guinea pig

Intracellular analysis of synaptic mechanisms controlling spontaneous and cortically induced... LOUIS Je GOLDBERG UCLA, Department of Oral Biology, School of Dentistry, Department of Anatomy, School of Medicine, Department of Kinesiology, the Brain Research Institute, Los Angeles, California 90024 SUMMARY CONCLUSIONS I. Intracellular recordings were obtained from guinea pig -closer motoneurons during cortically induced spontaneously occurring rhythmical (RJMs). 2. It was determined that short pulsetrain stimulation of the masticatory area of the cortex produced an inhibitory postsynaptic potential (IPSP) in -closer motoneurons, followed by a longer latency excitatory postsynaptic potential (EPSP). The cortically induced IPSP was compared to the IPSP induced by inhibitory inputs activated by intraoral stimulation with respect to their sensitivity to Cl- diffusion from the recording micropipette. It was suggested, based on electrophysiological techniques, that the cortical stimulus activates inhibitory premotor cells that have their inputs located predominately on the soma region of the cell. 3. The long-duration hyperpolarizing potentials evoked by repetitive cortical stimulation were shown to be IPSPs. These IPSPs were coincident with the digastric electromyographic (EMG) burst phase of the RJM cycle. The long-duration IPSPs were composed of short-latency subunit IPSPs that were time-locked to each cortical stimulus. 4. It was shown that during spontaneous RJMs the rhythmically occurring hyperpolarizing potentials in -closer http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

Intracellular analysis of synaptic mechanisms controlling spontaneous and cortically induced rhythmical jaw movements in the guinea pig

Download PDF
13 pages

Loading next page...
 
/lp/the-american-physiological-society/intracellular-analysis-of-synaptic-mechanisms-controlling-spontaneous-9hH7wjRH7Z

References

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
The American Physiological Society
Copyright
Copyright © 1982 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
Publisher site
See Article on Publisher Site

Abstract

LOUIS Je GOLDBERG UCLA, Department of Oral Biology, School of Dentistry, Department of Anatomy, School of Medicine, Department of Kinesiology, the Brain Research Institute, Los Angeles, California 90024 SUMMARY CONCLUSIONS I. Intracellular recordings were obtained from guinea pig -closer motoneurons during cortically induced spontaneously occurring rhythmical (RJMs). 2. It was determined that short pulsetrain stimulation of the masticatory area of the cortex produced an inhibitory postsynaptic potential (IPSP) in -closer motoneurons, followed by a longer latency excitatory postsynaptic potential (EPSP). The cortically induced IPSP was compared to the IPSP induced by inhibitory inputs activated by intraoral stimulation with respect to their sensitivity to Cl- diffusion from the recording micropipette. It was suggested, based on electrophysiological techniques, that the cortical stimulus activates inhibitory premotor cells that have their inputs located predominately on the soma region of the cell. 3. The long-duration hyperpolarizing potentials evoked by repetitive cortical stimulation were shown to be IPSPs. These IPSPs were coincident with the digastric electromyographic (EMG) burst phase of the RJM cycle. The long-duration IPSPs were composed of short-latency subunit IPSPs that were time-locked to each cortical stimulus. 4. It was shown that during spontaneous RJMs the rhythmically occurring hyperpolarizing potentials in -closer

Journal

Journal of Neurophysiology – The American Physiological Society

Published: Jul 1, 1982

There are no references for this article.