The membrane systems of the cardiac muscle cell of Meganychtiphanes norvegica (M. Sars), euphauciacea,crustacea |
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| Authors: | Dr Reidar Myklebust |
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| Institution: | (1) Cellular Cardiology Research Group, Institute of Anatomy, University of Bergen, Norway;(2) Institute of Anatomy, Årstadveien 19, N-5000 Bergen, Norway |
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| Abstract: | Summary The membrane systems of cardiac muscle cells of the euphausiacean Meganychtiphanes norvegica are described. Transverse tubules are found both at the Z-band level (Tz-tubules) and at the H-band level (Th-tubules). Within the sarcomere narrow longitudinal tubules branch off from the Tz-tubules. At the H-band level these tubules expand forming flattened cisternae in dyadic and triadic couplings with the sarcoplasmic reticulum (SR). Adjacent myofibrils are separated by a well developed SR. Modifications of the SR are seen at the H-band level where junctional cisternae are formed. |
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| Keywords: | Cardiac sarcomere Meganychtiphanes norvegica T-tubule system Sarcoplasmic reticulum Couplings |
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