. The anatomical record. Anatomy; Anatomy. 358 GEORGE W. TANNREUTHER become divided into four equipotent regions. The question arises, if the blastoderm with the four primitive streaks con- tinued to develop, would the four resulting embryos be inde- pendent or united into a single monster. Judging from the conditions found in figure 3, four distinctly independent embryos would have resulted. Figure 2 represents an embryo of about twenty-one hours' incubation. The area opaca, pellucida, and vasculosa are more ^. ^' Fig. 2 elongated than in the normal blastoderm. The early
. The anatomical record. Anatomy; Anatomy. 358 GEORGE W. TANNREUTHER become divided into four equipotent regions. The question arises, if the blastoderm with the four primitive streaks con- tinued to develop, would the four resulting embryos be inde- pendent or united into a single monster. Judging from the conditions found in figure 3, four distinctly independent embryos would have resulted. Figure 2 represents an embryo of about twenty-one hours' incubation. The area opaca, pellucida, and vasculosa are more ^. ^' Fig. 2 elongated than in the normal blastoderm. The early formation of the vascular area with the sinus terminalis does not show any departure from the normal course of development. The blas- toderm shows a single primitive streak, terminating at its an- terior end with two Hensen's nodes and head processes. The embryo anterior to the primitive streak is represented by an almost complete duplication of parts. The development of the head folds, the neural tubes, and the notochords correspond to the typical conditions. The head regions are distinctly inde-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bardeen, Charles Russell, 1871-1935, ed; Boyden, Edward A. (Edward Allen), 1886-1976; Bremer, John Lewis, 1874- ed; Hardesty, Irving, b. 1866, ed; American Association of Anatomists; American Society of Zoologists; Wistar Institute of Anatomy and Biology. [New York, etc. ] A. R. Liss [etc. ]
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1906
