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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Myklebust, R., Sætersdal, T.S., Engedal, H. et al. The T-tubule system in the myocardia of the sand rat and mouse as demonstrated by horseradish peroxidase. Cell Tissue Res. 192, 205–213 (1978). https://doi.org/10.1007/BF00220739
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DOI: https://doi.org/10.1007/BF00220739