. The development of the chick; an introduction to embryology. Birds -- Embryology. 396 THE DEVELOPMENT OF THE CHICK to almost eliminate the stroma, a condition that lasts up to the twelfth day, at least, after which the quantity of the stroma increases again with the ingrowth and enlargement of the blood-vessels. As the testis increases in size it projects more from the surface of the Wolffian body, and folds arise above and below it as well as in front and behind, that progressively narrow the surface. 'germ. £/>. Fig. 227. — Section through the gonad of a chick in the middle of the fifth
. The development of the chick; an introduction to embryology. Birds -- Embryology. 396 THE DEVELOPMENT OF THE CHICK to almost eliminate the stroma, a condition that lasts up to the twelfth day, at least, after which the quantity of the stroma increases again with the ingrowth and enlargement of the blood-vessels. As the testis increases in size it projects more from the surface of the Wolffian body, and folds arise above and below it as well as in front and behind, that progressively narrow the surface. 'germ. £/>. Fig. 227. — Section through the gonad of a chick in the middle of the fifth day. Indifferent stage. The sexual cords have reached the germinal epithelium; the primitive ova are appearing in the cords. (After Semon.) c T, Connective tissue, germ. Ep., Germinal epithelium. M. ep., Epithelium of the mesentery, pr. O., Primitive ova. s. C, Sexual cords. of apposition, which in this way becomes gradually reduced to form the hilum of the testis, through which the sexual cords pass to the neighboring renal corpuscles (cf. Figs. 221 and 222). As the testis is attached to the anterior portion of the Wolffian body, the latter may be divided in two portions, an anterior. 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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