The T-tubule system in the myocardia of the sand rat and mouse as demonstrated by horseradish peroxidase |
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Authors: | Dr. Reidar Myklebust Thorvald S. Sætersdal Hogne Engedal Cellular Cardiology Research Group |
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Affiliation: | (1) Institute of Anatomy, University of Bergen, Bergen, Norway;(2) Division of Cardiac Surgery, Bergen University Hospital, Bergen, Norway;(3) Institute of Anatomy, Årstadveien 19, University of Bergen, N-5000 Bergen, Norway |
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Abstract: | Summary The transverse tubule (T-tubule) system in papillary muscles of the sand rat and the mouse were studied with the aid of a diffusion tracer (horseradish peroxidase). The T-tubule system in the sand rat showed a typical mammalian pattern with sarcolemmal tubules invaginating at the Z-band level of the sarcomere. These tubules follow a transverse direction in the cell with frequent longitudinal side-branches which connect tubules at different Z-band levels. In the mouse myocardium, the T-tubules also start as lateral invaginations from the sarcolemma at the Z-band levels. In the cell interior, however, the tubules ramify and brake up into a complicated system of spirally running tubules. These spirals, of relative small diameter (400Å–700Å), frequently expand and form lobulated cisternae at the Z-band levels. |
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Keywords: | Myocardium T-tubule system Horseradish peroxidase Sand rat Mouse |
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