卵殼膜分裂線の比較解剖学的研究
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The splitting lines in the soft tissues have been studied by Otto Burkard (1903), Klaus Niessing (1935), Fukui ('36), Renri ('51) and other investigators. Report, however, is not available with regard to the splitting lines of the shell membrane of eggs. The present report deals with the experimental observations conducted on the splitting lines of shell membranes obtained from the eggs of domestic fowls, domestic ducks and quails. The egge for the experiment were hard-boiled, then cooled by the water. The shell was then either removed carefully with finger tips from the egg or dissolved of the egg by means of 5 percent hydrochloric acid to expose the shell membrane. The exposed shell membrane was then punctured. The shell membrane is made up of two layers of sheet, upper and lower, and the upper layer was first observed before going to the lower one. The results of the observation were summarized as follows. 1) The running courses of the splitting lines developing in both layers of the shell membrane are perfectly idetical. 2) Viewing the egg with its blunted end directed up, the splitting lines ran like slanting streaks from upper left to lower right direction around the body of the egg. 3) Viewing the egg with its blunted end directed up, the splitting lines at both the blunt and tapering ends of the egg were observed forming anticlockwise spirals, the degree of curvature of the one at the blunt end being more intense than at the tapering end. 4) As to the reason of this spiral formation at both ends of the egg the author is of the opinion that the screwy folds lining the inside surface of the oviduct would be responsible for imprinting the spiral streaks on the surface of just forming shell memdrane of the egg while it is passing there. 5) Further, as to the reason of occurrence of irregular mass of the splitting lines on both ends of certain eggs the author is of the opinion that it would depends on sizes of the egg, because, as the experiments have shown, the egg of domestic duck, the largest of the three, has the irreglar mass of splitting lines in the center of both ends and the medium-sized egg of domestic fowl has also the similar pattern of splitting lines but mingled with trace of spiral formation and finally the egg of quail, the smallest of the three, shows no sign of irregular mass of splitting lines. It seems probable that larger mechanical force of the folds in the oviduct exerted upon larger bulk of the egg during its passage there would cause the formation of the irregular splitting lines at both ends of the egg, a disturdance of the growth orientation in the shell membrane manifested as its direct functional response against the extrinsic forces involved.
- 九州歯科学会の論文
- 1957-12-31
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