. Embryology. Embryology; Embryology; genealogy. Fig. 24. The fate of the gray crescent in normal development. Left: The gray crescent is shown with a square of blue dye applied as a marker. Center: In a later stage of development (gastrula) the gray crescent is no longer visible but the marker persists and is found just above the dorsal lip. Right: With further development of the gastrula into an embryo the blue marker can be traced into the head endoderm. Therefore the normal fate of the gray crescent protoplasm is to form head ANTERIOR END EARLY GASTRULA Fig. 25. The fate of vari
. Embryology. Embryology; Embryology; genealogy. Fig. 24. The fate of the gray crescent in normal development. Left: The gray crescent is shown with a square of blue dye applied as a marker. Center: In a later stage of development (gastrula) the gray crescent is no longer visible but the marker persists and is found just above the dorsal lip. Right: With further development of the gastrula into an embryo the blue marker can be traced into the head endoderm. Therefore the normal fate of the gray crescent protoplasm is to form head ANTERIOR END EARLY GASTRULA Fig. 25. The fate of various regions of the gastrula during development. Right: A simplified diagram of the embryo at a stage when various structures can be visibly identified. Abate: Outline of an early gastrula with the dorsal lip as a point of orientation, a, b, c, etc. are small groups of cells stained with dyes in order to mark these regions and trace them into the embryo. The same letters appear in the embryo and mark the structures or regions derived from the corre- sponding groups of cells in the gastrula. 58. 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
