. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE URIXOGENITAL SYSTEM 379 taneously: primary tubules are formed in each somite from the most ventral portion of the nephrogenous tissue; then secondary tubules later from an intermediate portion, and tertiary tubules later yet from the dorsal portion. Fig. 217 represents a transverse section through the middle. fc^"'o" .wyt. Tl i^ G/om. ^^- %^ Pjq_ 217.—Transverse section through the middle of the Wolffian body of a chick embryo of 96 hours. Ao., Aorta. Coel., Coelome. Col. T.,
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE URIXOGENITAL SYSTEM 379 taneously: primary tubules are formed in each somite from the most ventral portion of the nephrogenous tissue; then secondary tubules later from an intermediate portion, and tertiary tubules later yet from the dorsal portion. Fig. 217 represents a transverse section through the middle. fc^"'o" .wyt. Tl i^ G/om. ^^- %^ Pjq_ 217.—Transverse section through the middle of the Wolffian body of a chick embryo of 96 hours. Ao., Aorta. Coel., Coelome. Col. T., Collecting tubule. Glom., Glomerulus, ^erm. Ep., Germinal epithehum M s t., Mesentery, n. t., Nephrogenous tissue. T. 1, 2d, Primary, secondary, and tertiary mesonephric tubules. V. c. p., -fos- terior cardinal vein. W. D., Wolffian duct. of the Wolffian body at the stage of ninety-six hours, showing a primary, secondary, and tertiary tubule. The primary tubule is typically differentiated; the secondary has formed the secretmg tubule and the rudiment of the renal corpuscle, but the tubule does not yet open into the Wolffian duct, though it is connected with it; tiie tertiary tubule is still in the vesicular stage. Some undifferentiated nephrogenous"^ tissue remains above the rudi- ment of the tertiary tubule, which makes it possible that quar- ternary tubules may be formed later. Referring still to the same figure, it will be noted that the Wolffian duct itself has formed a considerable evagination dorso- medially (collecting tubule), with which both secondary and tertiary tubules are associated as well as the undifferentiated nephrogenous tissue. Similar evaginations are formed along the entire length of the functional portion of the 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 Lill
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Keywords: ., bookauthorlilliefrankrat, bookcentury1900, booksubjectembryology
