. Embryology. Embryology; Embryology; genealogy. Fig. 59. Late cleavage and very early blastula stage of the salamander egg, polar view. Left: In late cleavage note that the more central cells near the animal pole are smaller than the outer cells at the equator. Right: In the early blastula the cells are smaller than in late cleavage, but there are many more Fig. 60. Two early stages of gastrulation in the salamander egg. Left: The very beginnings of gastrulation. Some cells begin to migrate internally, and this re- sults in the dark line just above center. The cells above this dark li
. Embryology. Embryology; Embryology; genealogy. Fig. 59. Late cleavage and very early blastula stage of the salamander egg, polar view. Left: In late cleavage note that the more central cells near the animal pole are smaller than the outer cells at the equator. Right: In the early blastula the cells are smaller than in late cleavage, but there are many more Fig. 60. Two early stages of gastrulation in the salamander egg. Left: The very beginnings of gastrulation. Some cells begin to migrate internally, and this re- sults in the dark line just above center. The cells above this dark line constitute the dorsal lip of the blastopore. The early gastrula is viewed from the vegetal pole. Right: An early gastrula with a crescent-shaped dorsal lip. Cells are leaving the surface by moving over the dorsal lip into the interior, where they form the walls of the archenteron. (Courtesy Professor John A. Moore, Columbia University.). 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
