The development of the human body; a manual of human embryology . Fig. 20.—Four Stages in the Segmentation of the Ovum of a , Polar globule.—(Sobotta). This differentiation now begins by the peripheral cellsof the morula becoming less spherical in shape and laterforming a layer of flattened cells, the enveloping layer,surrounding the more spherical central cells (Fig. 21, A).In the latter vacuoles now make their appearance, espe- SEGMENTATION OF THE OVUM. 6l *£**U Jp2 V.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902