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Home  »  Anatomy of the Human Body  »  FIG. 9

Henry Gray (1825–1861). Anatomy of the Human Body. 1918.

FIG. 9




First stages of segmentation of a mammalian ovum. Semidiagrammatic. (From a drawing by Allen Thomson.) z.p. Zona striata. p.gl. Polar bodies. a. Two-cell stage. b. Four-cell stage. c. Eight-cell stage. d, e. Morula stage.