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

/meta·neph·ros/ (-nef´ros) pl. metaneph´roi   [Gr.] the primordium of the permanent kidney, developing later than and caudad to the mesonephros.

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

[-nef′rəs] pl. metanephra, metanephroi
Etymology: Gk, meta + nephros, kidney
the third, and permanent, excretory organ to develop in the vertebrate embryo. It consists of a complex structure of secretory and collecting tubules that develop into the kidney. In most mammals there is limited functional use of the metanephric kidney during fetal life because waste materials are transferred across the placenta to the mother for elimination. Also called hind kidney. See also kidney, mesonephros, pronephros.

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.

metanephros

pl. metanephroi [Gr.] the third and final attempt to produce a permanent embryonic kidney, developing later than and caudal to the mesonephros.