Localization of Amnion-Forming Areas in the Early Chick Blastoderm

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概要

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• 1. Conclusion reached by the previous study on embryos in somitestages ('42) that the so-called 'lymph vesicle' represents an amnion differentiated in the chorio-allantoic membrane, was also supported by the present experiments on blastoderm in head-process stage. 2. Localization of vesicle-forming areas in the head-process stage was tested by transplanting divided pieces of the blastoderm (fig.1). 3. Results show that the regions capable of forming vesicles almost coincide with the extension of the lateral mesoderm. Regions which have no or only a feeble capacity to produce vesicles are the foremost portion of the blastoderm and the median portion that is supposed to become the embryonic body proper. 4. There was noted a gradation of developmental potency as manifested by the frequency of vesicle-formation and of occurrence of vesicle that has shown peristaltic contraction. This was the highest in the median part of the hindermost portion of blastoderm, where there is the posterior middle half of the primitive streak, and was graded off anteriorly from this centre along the sides of the blastoderm. 5. Some necessary factors for the formation of amnion were suggested.

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著者

• 久米 又三

  Zoological Laboratory Faculty Of Science Ochanomizu University

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• Localization of Amnion-Forming Areas in the Early Chick Blastoderm
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