オニネズミ (Bandicota indica) の心筋細胞に関する微細形態学的検討

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  • Ultrastructure of Cardiac Myocytes in the Greater Bandicoot Rat (Bandicota Indica).
  • オニネズミ(Bandicota indica)の心筋細胞に関する微細形態学的検討〔英文〕
  • オニネズミ Bandicota indica ノ シン キン サイボウ ニ

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Cardiac myocytes in the left ventricle and atrium of the greater bandicoot rat (Bandicota indica) were examined by transmission electron microscopy. The fine structure showed typical features of mammalian cardiac myocytes. In atrial myocytes, however, the areas occupied by mitochondria were much smaller than that filled with myofibrils. The decrease in mitochondria and the abundance of myofibrils are thought to be an ultrastructural adaptation to the large body size of this species. Many conducting myocytes were observed in both atrium and ventricle. The atrial conducting myocytes were ultrastructurally different from the Purkinje fibers of the ventricle. We suggest that the abundance and the ultrastructural variation of conducting myocytes are related to the physiological aspects, such as body size, of this animal.

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