. Comparative anatomy. Anatomy, Comparative. 434 COMPARATIVE ANATOMY or Wolffian ducts become the ductus deferentes. It is generally assumed, but not demonstrated, that the mesonephros functions as an excretory organ in the embryo. Metanephros. The definitive kidney of man and other amniotes, the metanephros, is the last to appear in ontogenesis. Like the meso- nephros, it has a double origin. The collecting tubules and the ureter are derived from an outgrowth of the mesonephric duct. The cortex of the kidney, on the other hand, arises from the posterior portion of neural tube notochord dorsal
. Comparative anatomy. Anatomy, Comparative. 434 COMPARATIVE ANATOMY or Wolffian ducts become the ductus deferentes. It is generally assumed, but not demonstrated, that the mesonephros functions as an excretory organ in the embryo. Metanephros. The definitive kidney of man and other amniotes, the metanephros, is the last to appear in ontogenesis. Like the meso- nephros, it has a double origin. The collecting tubules and the ureter are derived from an outgrowth of the mesonephric duct. The cortex of the kidney, on the other hand, arises from the posterior portion of neural tube notochord dorsal aorta afferent vessel glomerulus efferent vessel somite. posterior cardinal vein collecting vein connecting sub-and post, cardinals. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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