. Embryology. Embryology; Embryology; genealogy. SYNTROPHOBLAST â /â¢. ENDODERM Fig. 172. Formation of the yolk sac, growth of the mesoderm, and differen- tiation of the trophoblast into the syntrophoblast and the chorion. MUSCLE LAYER O O O O O o- BLOOD VESSELS. 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 Barth, Lester G. (Lester George), 1905-1979. New York, Dryden Press

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Keywords: ., boo, bookcentury1900, booksubjectembryology, booksubjectgenealogy