Archive image from page 54 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 Fig. 21.—Four Stages in the Segmentation of the Ovum of a Mouse. X, Polar globule.—{Sobolta.) four-celled, five-celled, and six-celled stages having been observed in various instances. Nor is the result of the final segmentation a hollow vesicle or blastula, but a solid mass of cells, termed a morula, is formed. This structure is not, however, comparable to the blas- tula of the lower forms, but corresponds to a stage of reptilian dev

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Archive image from page 54 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 Fig. 21.—Four Stages in the Segmentation of the Ovum of a Mouse. X, Polar globule.—{Sobolta.) four-celled, five-celled, and six-celled stages having been observed in various instances. Nor is the result of the final segmentation a hollow vesicle or blastula, but a solid mass of cells, termed a morula, is formed. This structure is not, however, comparable to the blas- tula of the lower forms, but corresponds to a stage of reptilian devel- opment a little later than that shown in Fig. 20, since, as will be shown directly, the cells corresponding to the blastoderm and the

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