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The membrane systems of the cardiac muscle cell of Cirolana borealis Lilljeborg (Crustacea, Isopoda)

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Summary

The membrane systems of the cardiac muscle cell of the isopod Cirolana borealis Lilljeborg are described. The sarcolemma invaginates at the level of the Z band, forming transverse tubules. Narrow tubules branch off in a longitudinal direction from these transverse and radially arranged TZ-tubules forming a transverse collar at each A-I level, where dyadic and triadic junctions are formed with the sarcoplasmic reticulum. Two different orientations of the coupling discs have been detected in the supercontracted sarcomere, and this observation has been discussed. Adjacent myofibrils are separated by a double layer of sarcoplasmic reticulum.

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Authors and Affiliations

  1. Zoological Laboratory and Institute of Anatomy, University of Bergen, Bergen, Norway

    A. Tjønneland,  R. Myklebust & H. Jensen

Authors
  1. A. Tjønneland
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  2. R. Myklebust
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  3. H. Jensen
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Tjønneland, A., Myklebust, R. & Jensen, H. The membrane systems of the cardiac muscle cell of Cirolana borealis Lilljeborg (Crustacea, Isopoda). Cell Tissue Res. 163, 175–184 (1975). https://doi.org/10.1007/BF00221725

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  • DOI: https://doi.org/10.1007/BF00221725

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