metanephros


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Related to metanephros: pronephros, mesonephros

metanephros

 [met″ah-nef´ros] (pl. metaneph´roi) (Gr.)
the permanent embryonic kidney, developing later than and caudad to the mesonephros. adj., adj metaneph´ric.

met·a·neph·ros

, pl.

met·a·neph·roi

(met'ă-nef'ros, -roy),
The most caudally located of the three excretory organs appearing in the evolution of the vertebrates (the others being the pronephros and the mesonephros); in mammalian embryos, the metanephros develops caudal to the mesonephros during its regression, becoming the permanent kidney.
Synonym(s): hind kidney
[meta- + G. nephros, kidney]

metanephros

(mĕt′ə-nĕf′rŏs′)
n.
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.

met′a·neph′ric (-rĭk) adj.

metanephros

The embryonic precursor of the adult kidney, located caudal to the mesonephos, which develops after it. The metanephros is formed from mesenchymal tissue arising from fused nephrotomes in the sacral region and from the ureteric bud, an outgrowth of the mesonephric duct.

met·a·neph·ros

, pl. metanephroi (met'ă-nef'ros, -roy)
The most caudally located of the three excretory organs appearing in the evolution of the vertebrates (the others being the pronephros and the mesonephros); in mammalian embryos, the metanephros develops caudal to the mesonephros during its regression, becoming the permanent kidney.
[meta- + G. nephros, kidney]

metanephros

the functional kidney in adult reptiles, birds and mammals that replaces the MESONEPHROS in the developing embryo.
References in periodicals archive ?
For FITC-DBA staining, metanephros were incubated in 0.1% Triton for 30 min following a brief wash and then incubated overnight with 10 [micro]g/ml FITC-DBA at 4[degrees]C.
The NFAT family includes five members, NFAT1 to NFAT5, which are all regulated by Ca[sup]2+/Cn signal except NFAT5.[sup][8] Burn et al .'s study suggested that all five NFATs would express in the mouse metanephros from gestation day 11.5 to day 15.5.[sup][9] Metanephros development in mice begins on gestation day 10.5 and about 85% of the METs are achieved on gestation day 16.5.
WT-1, Pax2, Pax8, and Lim-1 were important genes which were associated with metanephros development.
Regarding luminal diameter in metanephros, statistically significant results on comparing group I with group III and group I with group V, showed that advanced mobile phone radiations were affecting the tissue more than conventional mobile phone radiations.
In metanephros, the results were statistical significant when group I was compared with all the experimental groups and when group II was compared with IV and group IV with V, for the cells lining the proximal tubules.
The problem occurs when the ureteric bud fails to make contact with the metanephros or if two ureteric buds arise from the mesonephric duct.
In an 18 mm fetus, the developing mesonephros, metanephros, suprarenal glands and gonads are supplied by nine pairs of lateral mesonephric arteries arising from the dorsal aorta.
(22-25) Deletion of both PAX8 and PAX2 genes prevents generation of the mesonephric (wolffian) duct and subsequent formation of all three embryonic kidneys (pronephros, mesonephros, and metanephros).
The metanephros or so-called permanent kidney in part provisional and vestigial.