. The development of the chick; an introduction to embryology. Birds -- Embryology. /Ms'cA fir'/?. /'/SJ 'A So' S/?lpI. Fig. 113.—Transverse section tlu-ough the fifteenth somite of the same embryo. pr'n. (14), (15), Pronephric tubules of the fourteenth and fifteenth somites, respectively. hardly pass the first stage when they appear as thickenings of the somatic layer of the somitic stalk; thus the Wolffian duct does not extend into this region, and the best developed pronephric tubules are confined to the tenth to the fifteenth somites. The pronephric tubules do not form Malpighian corpu
. The development of the chick; an introduction to embryology. Birds -- Embryology. /Ms'cA fir'/?. /'/SJ 'A So' S/?lpI. Fig. 113.—Transverse section tlu-ough the fifteenth somite of the same embryo. pr'n. (14), (15), Pronephric tubules of the fourteenth and fifteenth somites, respectively. hardly pass the first stage when they appear as thickenings of the somatic layer of the somitic stalk; thus the Wolffian duct does not extend into this region, and the best developed pronephric tubules are confined to the tenth to the fifteenth somites. The pronephric tubules do not form Malpighian corpuscles; but glomeruli develop as cellular buds at the peritoneal orifices of the posterior tubules, projecting into the coelome near the mesentery. Curiously enough these do not form at the time of greatest development of the tubules, but subsequently to this when the tubules themselves are in process of degeneration. Moreover, they are extremely variable as to number, and degree of development. They appear to be best developed on the third and fourth days. They agree in many respects with the so-called external glomeruli of the pronephros of Anamnia, and should be. 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 Lillie, Frank Rattray, 1870-1947. New York, Holt
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