CARDIAC MUSCLE

SummaryThe ultrastructure of chicken and frog cardiac muscle are compared and then contrasted with the ultrastructure of mammalian cardiac muscle. Both chicken and frog cardiac muscle have no transverse tubules, remarkably few nexuses and no prominent M-lines. M-fibers of both animals are small (2–5 μ) in diameter and contain dense granules. Chicken cardiac muscle like mammalian cardiac muscle has very well developed sarcoplasmic reticulum and couplings. The latter do not occur in frog cardiac muscle and the former is poorly developed in that muscle. Morphologic evidence is presented in the frog and chicken heart that would tend to attribute to the sarcoplasmic reticulum a transport function for electron-dense material (presumably proteinaceous) the possible significance of which is discussed. Purkinje fibers were identified in the form of a network on the endocardial surface of both atria and ventricles of chicken hearts. The topography of these fibers corresponds to that of a population of fibers in small mammalian hearts that, and unlike ventricular fibers in those animals, does not have transverse tubules.

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