. The development of the chick; an introduction to embryology. Birds -- Embryology. 382 THE DEVELOPMENT OF THE CHICK ances, however, it is probable that secretion begins in the tubules on the fifth day and increases in amount up to the eleventh day at least, when signs of degeneration become numerous. Presuma- bly the functional activity diminishes from this stage on, being replaced by the secretion of the permanent kidney. 5rC-7i^ Gonrk. Fig. 220. — Transverse section through the mesonephros and neighboring parts of a 6-day chick, in the region of the spleen. Ao., Aorta, bl. V., Blood vessels
. The development of the chick; an introduction to embryology. Birds -- Embryology. 382 THE DEVELOPMENT OF THE CHICK ances, however, it is probable that secretion begins in the tubules on the fifth day and increases in amount up to the eleventh day at least, when signs of degeneration become numerous. Presuma- bly the functional activity diminishes from this stage on, being replaced by the secretion of the permanent kidney. 5rC-7i^ Gonrk. Fig. 220. — Transverse section through the mesonephros and neighboring parts of a 6-day chick, in the region of the spleen. Ao., Aorta, bl. V., Blood vessels (sinusoids). Caps., Cap- sule of renal corpuscle. Coel., Coelome. col. T., Collecting tubule. D., Dorsal. Giz., Gizzard. Glom., Glomerulus. Gon., Gonad. L., Left. Spl., Spleen. Sr. C, Cortical sub- stance of the suprarenal, s. t., Secreting tubule. T. R., Tubal ridge. V., Ventral. V. c. p., Posterior cardinal vein V. s'c. 1., Left subcardinal vein. W. D., Wolffian duct. Figs. 220 and 221 represent sections through the mesonephros on the sixth and eighth days respectively (see also Fig. 222, eleven days). The renal corpuscles show the typical capsule and glomerulus, and relation to the secreting tubules. The latter are considerably convoluted on the sixth day, much more so on the eighth day. The conducting tubules can usually be distin- guished by their smaller caliber and thinner walls. The Wolffian. 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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