Shape and disposition of clefts,tubules, and sarcoplasmic reticulum in long and short sarcomere fibers of crab and crayfish |
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Authors: | Clara Franzini-Armstrong Abraham B Eastwood Lee D Peachey |
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Institution: | (1) Department of Anatomy, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;(2) Muscular Dystrophy Association, New York, New York, USA;(3) Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, USA;(4) Department of Biology G7, University of Pennsylvania, 19104 Philadelphia, PA, USA |
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Abstract: | Summary The disposition of surface invaginations (clefts, Z and T tubules) and of the sarcoplasmic reticulum has been examined by electron microscopy at three accelerating voltages (100, 200 and 1000 kV) and by phase-contrast light microscopy in crustacean muscles infiltrated by the Golgi stain. In long-sarcomere, tonic type fibers, an extensive system of invaginating clefts has been observed, along with both Z and T tubules. Z and T tubules form interconnections with each other, but only T tubules form specific contacts with the sarcoplasmic reticulum, which in these fibers forms an extended and continuously fenestrated network. In short-sarcomere, phasic type fibers, a ladder-like disposition of an abundant T network is found. Z tubules are absent in these fibers. The sarcoplasmic reticulum forms more frequent junctions with flattened areas of T tubules and with clefts, but has less extensive free surfaces than in the long-sarcomere fibers.We wish to dedicate this paper to the late Graham Hoyle, whose lifetime of work and interest in the study of muscle from a comparative point of view has been an inspiration to us. |
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Keywords: | Crustacean muscle T tubules Sarcoplasmic reticulum Golgi stain High-voltage electron microscopy Portunus sp Procambarus clarkii |
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