Comparison of membrane properties of the cell body and the initial part of the axon of phasic motoneurones in the ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1974-05

AUTHORS

D. W. Richter, W. R. Schlue, K. -H. Mauritz, A. C. Nacimiento

ABSTRACT

Membrane properties of the cell body and the initial part of the axon of cat phasic motoneurones were analyzed. The mean input resistance was 9.1 MΩ in the axon and 2.0 MΩ in the cell body. A great scattering of values, however, was observed in the axons. The passive membrane time constants were 0.35 msec (τm) in the axon and 3.2 msec (τm) and 0.63 msec (τ1) in the soma. A close electrotonic coupling between the soma and the axon was shown by means of synaptic potentials. In the cell body the threshold for excitation was 1.46 times higher than in the axon (14.2 mV and 9.7 mV respectively). Stimulating with current pulses an S-shaped spike inactivation curve was found in the axon. At threshold current intensity, spike inactivation reached 37.2%. In the cell body either no or only slight inactivation (7%) occurred at rheobase. During suprathreshold current stimulation the axon discharged only a few spikes, whereas the soma fired steadily. The current-frequency curve of the soma consisted of two linear ranges and, in addition, a logarithmic range quite similar to the logarithmic frequency curve of the axon was observed. The differences of the discharge behaviour of the cell body and the axon were discussed. More... »

PAGES

193-206

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00234013

DOI

http://dx.doi.org/10.1007/bf00234013

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1017706942

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/4837738


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55 schema:description Membrane properties of the cell body and the initial part of the axon of cat phasic motoneurones were analyzed. The mean input resistance was 9.1 MΩ in the axon and 2.0 MΩ in the cell body. A great scattering of values, however, was observed in the axons. The passive membrane time constants were 0.35 msec (τm) in the axon and 3.2 msec (τm) and 0.63 msec (τ1) in the soma. A close electrotonic coupling between the soma and the axon was shown by means of synaptic potentials. In the cell body the threshold for excitation was 1.46 times higher than in the axon (14.2 mV and 9.7 mV respectively). Stimulating with current pulses an S-shaped spike inactivation curve was found in the axon. At threshold current intensity, spike inactivation reached 37.2%. In the cell body either no or only slight inactivation (7%) occurred at rheobase. During suprathreshold current stimulation the axon discharged only a few spikes, whereas the soma fired steadily. The current-frequency curve of the soma consisted of two linear ranges and, in addition, a logarithmic range quite similar to the logarithmic frequency curve of the axon was observed. The differences of the discharge behaviour of the cell body and the axon were discussed.
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