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STUDIES OF THE TRIAD : I. Structure of the Junction in Frog Twitch Fibers
The structure of the junction between sarcoplasmic reticulum (SR) and transverse tubular (T) system at the triad has been studied in twitch fibers of the frog. The junction is formed by flattened surfaces of the SR lateral sacs and the T-system tubule, which face each other at a distance of 120–140...
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Formato: | Texto |
Lenguaje: | English |
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The Rockefeller University Press
1970
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2108094/ https://www.ncbi.nlm.nih.gov/pubmed/19866746 |
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author | Franzini-Armstrong, Clara |
author_facet | Franzini-Armstrong, Clara |
author_sort | Franzini-Armstrong, Clara |
collection | PubMed |
description | The structure of the junction between sarcoplasmic reticulum (SR) and transverse tubular (T) system at the triad has been studied in twitch fibers of the frog. The junction is formed by flattened surfaces of the SR lateral sacs and the T-system tubule, which face each other at a distance of 120–140 A. At periodic intervals of about 300 A, the SR membrane forms small projections, whose tips are joined to the T system membrane by some amorphous material. The SR projections and the amorphous material are here called SR feet. The feet are disposed in two parallel rows, two such rows being present on either side of the T-system tubule. The junctional area between the feet is apparently empty. The feet cover no more than 30% of the T system surface area and 3% of the total SR area. The functional significance of this interpretation of the junctional structure is discussed. |
format | Text |
id | pubmed-2108094 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1970 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-21080942008-05-01 STUDIES OF THE TRIAD : I. Structure of the Junction in Frog Twitch Fibers Franzini-Armstrong, Clara J Cell Biol Article The structure of the junction between sarcoplasmic reticulum (SR) and transverse tubular (T) system at the triad has been studied in twitch fibers of the frog. The junction is formed by flattened surfaces of the SR lateral sacs and the T-system tubule, which face each other at a distance of 120–140 A. At periodic intervals of about 300 A, the SR membrane forms small projections, whose tips are joined to the T system membrane by some amorphous material. The SR projections and the amorphous material are here called SR feet. The feet are disposed in two parallel rows, two such rows being present on either side of the T-system tubule. The junctional area between the feet is apparently empty. The feet cover no more than 30% of the T system surface area and 3% of the total SR area. The functional significance of this interpretation of the junctional structure is discussed. The Rockefeller University Press 1970-11-01 /pmc/articles/PMC2108094/ /pubmed/19866746 Text en Copyright © 1970 by The Rockefeller University 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 Franzini-Armstrong, Clara STUDIES OF THE TRIAD : I. Structure of the Junction in Frog Twitch Fibers |
title | STUDIES OF THE TRIAD : I. Structure of the Junction in Frog Twitch Fibers |
title_full | STUDIES OF THE TRIAD : I. Structure of the Junction in Frog Twitch Fibers |
title_fullStr | STUDIES OF THE TRIAD : I. Structure of the Junction in Frog Twitch Fibers |
title_full_unstemmed | STUDIES OF THE TRIAD : I. Structure of the Junction in Frog Twitch Fibers |
title_short | STUDIES OF THE TRIAD : I. Structure of the Junction in Frog Twitch Fibers |
title_sort | studies of the triad : i. structure of the junction in frog twitch fibers |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2108094/ https://www.ncbi.nlm.nih.gov/pubmed/19866746 |
work_keys_str_mv | AT franziniarmstrongclara studiesofthetriadistructureofthejunctioninfrogtwitchfibers |