. Chordate anatomy. Chordata; Anatomy, Comparative. Y- -^.'r^r^,**,' Fig. 46.—Section transverse to the primitive streak of a chick embryo of about 15 hours incubation. The section is taken near the middle of the length of the streak. EC, ectoderm; EN, endoderm; MES, mesoderm; PG, primitive groove of primitive streak; y, yolk at inner margin of area opaca. X 100. (After Duval, "Atlas d';) In the sauropsidan embryo, then, as in the amphibian, rapid growth and cell proliferation within the blastoporal rim is the primary source of mesoderm. Early Development in Placental Mam
. Chordate anatomy. Chordata; Anatomy, Comparative. Y- -^.'r^r^,**,' Fig. 46.—Section transverse to the primitive streak of a chick embryo of about 15 hours incubation. The section is taken near the middle of the length of the streak. EC, ectoderm; EN, endoderm; MES, mesoderm; PG, primitive groove of primitive streak; y, yolk at inner margin of area opaca. X 100. (After Duval, "Atlas d';) In the sauropsidan embryo, then, as in the amphibian, rapid growth and cell proliferation within the blastoporal rim is the primary source of mesoderm. Early Development in Placental Mammals The early development of placental mammals exhibits features peculiar to the group and more or less difficult of comparison with any- thing in the development of lower vertebrates. The minute egg (Fig. 29). 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
