Archive image from page 52 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 Fig. 19.—Four Stages in the Segmentation Chick.—(Coste.) of the Blastoderm of the Beyond this period no regularity can be discerned in the appearance of the segmentation planes; but radial and circular divisions con- tinuing to form, the disk becomes divided into a large number of cells, those at the center being much smaller than those at the per- iphery. In the meantime, however, the smaller central cells have begun to divide in pla

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Archive image from page 52 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 Fig. 19.—Four Stages in the Segmentation Chick.—(Coste.) of the Blastoderm of the Beyond this period no regularity can be discerned in the appearance of the segmentation planes; but radial and circular divisions con- tinuing to form, the disk becomes divided into a large number of cells, those at the center being much smaller than those at the per- iphery. In the meantime, however, the smaller central cells have begun to divide in planes parallel to the surface of the disk, which, from being a simple plate of cells, thus becomes a discoidal cell- mass.

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