ユウレイボヤの心臓の細胞構築について
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概要
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The heart of Ciona intestinalis consists of the pericardium and the heart wall itself which is formed of invagination of the pericadial wall as a deep longitudinal fold with the lips approximating each other. The heart cavity is not lined with the endothelial cells and the heart wall is composed of a simple layer of the cardiac muscle cells, which is continuous along one edge with the simple cuboidal epithelia of the pericardial wall. The cardiac muscle cells are of long spindle form with a centrally placed nucleus. The basal cytoplasm is occupied by a single myofibril with cross-striation. These cells are spirally oriented to the long axis of V-shaped heart and the direction of gyres is bilaterally symmetrical. This seems to be an apt structure for rhythmical reversal of heart beat. A row of one or more cuboidal cells lying between the cardiac muscle cells extends from one end of the heart to the other, in parallel with its long axis, and increases in width at the both ends. These cuboidal cells are rich in RNA but contain poorly developed organelles and no myofibril. Their morphological feature is similar to that of undifferentiated cells. This suggests that the linear structure may play a role as a center of heart growth rather than as the stimulus conducting system. In small limited areas between the linear structure and the lips of myocardium at both ends of the tubular heart, orientation of the cardiac muscle cells is irregular rather than an uniform spiral arrangement of the other cardiac muscle cells. Locality of pacemaker may be related in these two special areas.
- 社団法人日本動物学会の論文
- 1967-05-15