Metanephros

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metanephros

[‚med·ə′ne‚fräs]
(embryology)
One of the posterior of three pairs of vertebrate renal structures; persists as the definitive or permanent kidney in adult reptiles, birds, and mammals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Metanephros

 

a paired excretory organ in reptiles, birds, mammals, and man that replaces the mesonephros in the course of embryonic development.

The uriniferous tubules of the metanephros form from the nonsegmented posterior part of the nephrotome; unlike the uriniferous tubules of the mesonephros, they begin at the malpighian corpuscles. The ends of the tubules of the metanephros open not into the wolffian duct, as in the mesonephros, but into the ureter, an outgrowth of it.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.