The development of the human body; a manual of human embryology . C D Fig. 17.—Stages in the Segmentation op Amblystoma.—(Eycles- hymer.) stages of segmentation the small cells of the upper poledivide more rapidly than the larger ones of the lower pole,the activity of the latter seeming to be retarded by theaccumulation of the yolk, and the resulting blastula (, D) shows a very decided difference in the size of thecells of the two poles. SEGMENTATION OF THE OVUM. 57 In the ova of reptiles and birds the amount of yolkstored up in the ovum is very much greater even than inthe amphibia, and
The development of the human body; a manual of human embryology . C D Fig. 17.—Stages in the Segmentation op Amblystoma.—(Eycles- hymer.) stages of segmentation the small cells of the upper poledivide more rapidly than the larger ones of the lower pole,the activity of the latter seeming to be retarded by theaccumulation of the yolk, and the resulting blastula (, D) shows a very decided difference in the size of thecells of the two poles. SEGMENTATION OF THE OVUM. 57 In the ova of reptiles and birds the amount of yolkstored up in the ovum is very much greater even than inthe amphibia, and it is aggregated at one pole of the ovumof which it forms the principal mass, the yolkless proto-plasm appearing as a small disk upon the surface of arelatively huge mass of yolk. The inertia of this mass of
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
