. Embryology. Embryology; Embryology; genealogy. MANDIBULAR ARCH. OPEN BRAIN NEURAL FOLD Fig. 184. A human embryo about three weeks after fertilization. (From G. W. Corner, Carnegie Institution of Washington Publication No. 394.) 275. 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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