Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The third and final excretory organ that develops in a vertebrate embryo. In birds, reptiles, and mammals it replaces the mesonephros as the functional excretory organ and develops into the adult kidney.
from The Century Dictionary.
- noun Same as
metanephron .
from the GNU version of the Collaborative International Dictionary of English.
- noun (Anat.) The most posterior of the three pairs of embryonic renal organs developed in many vertebrates.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun anatomy The most
posterior of the threepairs ofembryonic renal organs developed in manyvertebrates .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The secretory tubules are developed from the metanephros, which is moulded over the growing end of the diverticulum from the Wolffian duct.
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These embryonic structures are on either side; the pronephros, the mesonephros, the metanephros, and the Wolffian and Müllerian ducts.
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The pronephros disappears very early; the structural elements of the mesonephros mostly degenerate, but in their place is developed the genital gland in association with which the Wolffian duct remains as the duct of the male genital gland, the Müllerian as that of the female; some of the tubules of the metanephros form part of the permanent kidney.
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The metanephros arises in the intermediate cell mass, caudal to the mesonephros, which it resembles in structure.
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The tubules of the metanephros, unlike those of the pronephros and mesonephros, do not open into the Wolffian duct.
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Each kidney has a two-fold origin, part arising from the metanephros, and part as a diverticulum from the hind-end of the Wolffian duct, close to where the latter opens into the cloaca (Figs. 1115, 1116).
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Mt. and Mt. d., the metanephros and metanephric duct, become the functional kidney and ureter in both sexes.
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Mt., the metanephros, is, in - actual fact - [the frog], indistinguishably continuous with Ms., and is the functional kidney, its duct
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In mice, CD24 expression is preferentially upregulated in the developing mouse metanephros as compared with the surrounding intermediate mesoderm, but its role and expression in the developing human kidney has not been well described.
Naturejobs - All Jobs Larissa Ivanova 2010
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In fish and amphibia the kidney is derived directly from an embryonic organ known as the mesonephros, while in reptiles and mammals the mesonephros degenerates towards the end of embryonic life and plays no role in the formation of the adult kidney, which is formed instead from a discrete spherical mass of mesodermal tissue, the metanephros, which develops quite independently from the mesonephros.
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