. The development of the chick; an introduction to embryology. Birds -- Embryology. THE URINOGEXITAL SYSTEM 393 indifferent gonad, viz., the stroma cells and the sexual cords (segmental or genital cords). The stroma is formed from mesen- chyme situated internal to the germinal epithelium. It is a very narrow layer at first, and is formed, in part at least, by pro- liferation of the germinal epithelium itself, in the same manner as mesenchyme is formed elsewhere by proliferation from the mesoderm. The stroma of the gonad is separated from the tubules. Fig. 226.—Cross-section through the genital
. The development of the chick; an introduction to embryology. Birds -- Embryology. THE URINOGEXITAL SYSTEM 393 indifferent gonad, viz., the stroma cells and the sexual cords (segmental or genital cords). The stroma is formed from mesen- chyme situated internal to the germinal epithelium. It is a very narrow layer at first, and is formed, in part at least, by pro- liferation of the germinal epithelium itself, in the same manner as mesenchyme is formed elsewhere by proliferation from the mesoderm. The stroma of the gonad is separated from the tubules. Fig. 226.—Cross-section through the genital primordiuni of Limosa iego- cephala. (After Hoffmann, from FeHx and Biihler.) The stage is simihir to that of a chick embryo of 4^ days. Germ., Germinal epithelium. Mst., Mesentery. S. C, Sexual cords. v., Posterior cardinal vein. W. D., Wolffian duct. of the Wolffian body by the numerous blood-vessels on the me- dian aspect of the latter. Up to the middle of the period of incubation, and a little later, it is extremely sparse; it increases subsequently as a result of ingrowth of the blood-vessels and accompanying connective 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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