Key result
Freeze-etching electron microscopy of myocardial cells revealed that transverse tubule apertures appear in parallel rows corresponding to inter-myofibril spaces and Z regions.
Freeze-etching electron microscopy reveals that transverse tubule apertures on mammalian myocardial cells are arranged in parallel rows corresponding to myofibril structures.
No immediate clinical implications from this animal study; extends ultrastructural mapping of myocardial T-tubules for future research.
The technique of " freezeetching" tissues for electron microscopy has permitted observation of the external apertures of the transverse tubules. The apertures appear on the cell surface in approximately parallel rows, which can be interpreted as corresponding longitudinally to the spaces between the myofibrils and transversely to the Z regions of the myofibrils.
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Rayns et al. (1967) studied this question. Freeze-etching electron microscopy of myocardial cells revealed that transverse tubule apertures appear in parallel rows corresponding to inter-myofibril spaces and Z regions.
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