. Comparative anatomy. Anatomy, Comparative. NEPHROSTOMY PRINCIPAL DIVISION PRIMITIVE DUCT SUPPLEMENTARY DIVISION NEPHROSTOME HYPOMERE ^OUTER GLOMERULUS Fig. 354.—A diagram showing three stages A-C in the development of the primitive duct. The duct and each tubule connected with it arises from the mesomere. Two types of glomeruli—outer and inner—become associated with the pronephric tubules. (Redrawn after Felix.) The mesonephros probably functions during foetal life. The metanephros is the definitive kidney. The occurrence of three kidneys in the embryos of amniotes is best interpreted by the
. Comparative anatomy. Anatomy, Comparative. NEPHROSTOMY PRINCIPAL DIVISION PRIMITIVE DUCT SUPPLEMENTARY DIVISION NEPHROSTOME HYPOMERE ^OUTER GLOMERULUS Fig. 354.—A diagram showing three stages A-C in the development of the primitive duct. The duct and each tubule connected with it arises from the mesomere. Two types of glomeruli—outer and inner—become associated with the pronephric tubules. (Redrawn after Felix.) The mesonephros probably functions during foetal life. The metanephros is the definitive kidney. The occurrence of three kidneys in the embryos of amniotes is best interpreted by the evolution theory. Pronephros. The pronephros or "head kidney" is the anterior-most of the three, and in the human embryo develops from the nephrotomes of segments seven to fourteen. The first of the pronephric tubules makes its appearance in a mm. embryo, and all eight tubules are formed by the time the embryo has reached a length of mm. Degeneration begins soon and the anterior tubules disappear before the posterior ones are differentiated. The development of pronephric tubules is initiated by the parietal layer of the nephrotome or intermediate cell mass from which cells are. 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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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
