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CARDIAC MUSCLE : A Comparative Study of Purkinje Fibers and Ventricular Fibers

With light and electron microscopy a comparison has been made of the morphology of ventricular (V) and Purkinje (P) fibers of the hearts of guinea pig, rabbit, cat, dog, goat, and sheep. The criteria, previously established for the rabbit heart, that V fibers are distinguished from P fibers by the r...

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Detalles Bibliográficos
Autores principales: Sommer, Joachim R., Johnson, Edward A.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1968
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2107380/
https://www.ncbi.nlm.nih.gov/pubmed/5645545
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author Sommer, Joachim R.
Johnson, Edward A.
author_facet Sommer, Joachim R.
Johnson, Edward A.
author_sort Sommer, Joachim R.
collection PubMed
description With light and electron microscopy a comparison has been made of the morphology of ventricular (V) and Purkinje (P) fibers of the hearts of guinea pig, rabbit, cat, dog, goat, and sheep. The criteria, previously established for the rabbit heart, that V fibers are distinguished from P fibers by the respective presence and absence of transverse tubules is shown to be true for all animals studied. No evidence was found of a permanent connection between the sarcoplasmic reticulum and the extracellular space. The sarcoplasmic reticulum (SR) of V fibers formed couplings with the sarcolemma of a transverse tubule (interior coupling) and with the peripheral sarcolemma (peripheral coupling), whereas in P fibers the SR formed only peripheral couplings. The forms of the couplings were identical. The significance, with respect to excitation-contraction coupling, of the difference in the form of the couplings in cardiac versus skeletal muscle is discussed together with the electrophysiological implications of the differing geometries of bundles of P fibers from different animals.
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spelling pubmed-21073802008-05-01 CARDIAC MUSCLE : A Comparative Study of Purkinje Fibers and Ventricular Fibers Sommer, Joachim R. Johnson, Edward A. J Cell Biol Article With light and electron microscopy a comparison has been made of the morphology of ventricular (V) and Purkinje (P) fibers of the hearts of guinea pig, rabbit, cat, dog, goat, and sheep. The criteria, previously established for the rabbit heart, that V fibers are distinguished from P fibers by the respective presence and absence of transverse tubules is shown to be true for all animals studied. No evidence was found of a permanent connection between the sarcoplasmic reticulum and the extracellular space. The sarcoplasmic reticulum (SR) of V fibers formed couplings with the sarcolemma of a transverse tubule (interior coupling) and with the peripheral sarcolemma (peripheral coupling), whereas in P fibers the SR formed only peripheral couplings. The forms of the couplings were identical. The significance, with respect to excitation-contraction coupling, of the difference in the form of the couplings in cardiac versus skeletal muscle is discussed together with the electrophysiological implications of the differing geometries of bundles of P fibers from different animals. The Rockefeller University Press 1968-03-01 /pmc/articles/PMC2107380/ /pubmed/5645545 Text en Copyright © 1968 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
Sommer, Joachim R.
Johnson, Edward A.
CARDIAC MUSCLE : A Comparative Study of Purkinje Fibers and Ventricular Fibers
title CARDIAC MUSCLE : A Comparative Study of Purkinje Fibers and Ventricular Fibers
title_full CARDIAC MUSCLE : A Comparative Study of Purkinje Fibers and Ventricular Fibers
title_fullStr CARDIAC MUSCLE : A Comparative Study of Purkinje Fibers and Ventricular Fibers
title_full_unstemmed CARDIAC MUSCLE : A Comparative Study of Purkinje Fibers and Ventricular Fibers
title_short CARDIAC MUSCLE : A Comparative Study of Purkinje Fibers and Ventricular Fibers
title_sort cardiac muscle : a comparative study of purkinje fibers and ventricular fibers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2107380/
https://www.ncbi.nlm.nih.gov/pubmed/5645545
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