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The narrow mass of embryonic mesoderm connecting somites and lateral mesoderm, from which the pronephros, mesonephros, metanephros, and their ducts develop.
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 It might be outdated or ideologically biased.



the primordium of the excretory organs in embryos of chordate animals and man. Each nephrotome is a paired metameric formation located between the somite—the segmented dorsal portion of the mesoderm—and the nonsegmented ventral portion of the mesoderm. The kidneys and their ducts and the vas deferens all develop from the nephrotome.

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