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Impulse Propagation at the Septal and Commissural Junctions of Crayfish Lateral Giant Axons

Transmission across the septal junctions of the segmented giant axons of crayfish is accounted for quantitatively by a simple equivalent circuit. The septal membranes are passive, resistive components and transmission is ephaptic, by the electrotonic spread of the action current of the pre-septal sp...

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Detalles Bibliográficos
Autores principales: Watanabe, A., Grundfest, H.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1961
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2195171/
https://www.ncbi.nlm.nih.gov/pubmed/14005158
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author Watanabe, A.
Grundfest, H.
author_facet Watanabe, A.
Grundfest, H.
author_sort Watanabe, A.
collection PubMed
description Transmission across the septal junctions of the segmented giant axons of crayfish is accounted for quantitatively by a simple equivalent circuit. The septal membranes are passive, resistive components and transmission is ephaptic, by the electrotonic spread of the action current of the pre-septal spike. The electrotonic spread appears as a septal potential, considerably smaller than the pre-septal spike, but usually still large enough to initiate a new spike in the post-septal segments. The septal membranes do not exhibit rectification, at least over a range of ± 25 mv polarization and this accounts for their capacity for bidirectional transmission. The commissural branches, which are put forth by each lateral axon, make functional connections between the two axons. Transmission across these junctions can also be bidirectional and is probably also ephaptic. Under various conditions, the ladder-like network of cross-connections formed by the commissural junctions can give rise to circus propagation of impulses from one axon to the other. This can give rise to reverberatory activity of both axons at frequencies as high as 400/sec.
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spelling pubmed-21951712008-04-23 Impulse Propagation at the Septal and Commissural Junctions of Crayfish Lateral Giant Axons Watanabe, A. Grundfest, H. J Gen Physiol Article Transmission across the septal junctions of the segmented giant axons of crayfish is accounted for quantitatively by a simple equivalent circuit. The septal membranes are passive, resistive components and transmission is ephaptic, by the electrotonic spread of the action current of the pre-septal spike. The electrotonic spread appears as a septal potential, considerably smaller than the pre-septal spike, but usually still large enough to initiate a new spike in the post-septal segments. The septal membranes do not exhibit rectification, at least over a range of ± 25 mv polarization and this accounts for their capacity for bidirectional transmission. The commissural branches, which are put forth by each lateral axon, make functional connections between the two axons. Transmission across these junctions can also be bidirectional and is probably also ephaptic. Under various conditions, the ladder-like network of cross-connections formed by the commissural junctions can give rise to circus propagation of impulses from one axon to the other. This can give rise to reverberatory activity of both axons at frequencies as high as 400/sec. The Rockefeller University Press 1961-11-01 /pmc/articles/PMC2195171/ /pubmed/14005158 Text en Copyright © Copyright, 1962, by The Rockefeller Institute Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Watanabe, A.
Grundfest, H.
Impulse Propagation at the Septal and Commissural Junctions of Crayfish Lateral Giant Axons
title Impulse Propagation at the Septal and Commissural Junctions of Crayfish Lateral Giant Axons
title_full Impulse Propagation at the Septal and Commissural Junctions of Crayfish Lateral Giant Axons
title_fullStr Impulse Propagation at the Septal and Commissural Junctions of Crayfish Lateral Giant Axons
title_full_unstemmed Impulse Propagation at the Septal and Commissural Junctions of Crayfish Lateral Giant Axons
title_short Impulse Propagation at the Septal and Commissural Junctions of Crayfish Lateral Giant Axons
title_sort impulse propagation at the septal and commissural junctions of crayfish lateral giant axons
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2195171/
https://www.ncbi.nlm.nih.gov/pubmed/14005158
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