Pronephros the most basic of the three excretory organs that develop in vertebrates, corresponding to the first stage of kidney development. It is succeeded by the mesonephros, which in fish and amphibians remains as the adult kidney. In amniotes the mesonephros is the embryonic kidney and a more complex metanephros acts as the adult kidney. Once ...
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http://en.wikipedia.org/wiki/Pronephros
• (n.) Alt. of Pronephron
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http://thinkexist.com/dictionary/meaning/pronephros/
most primitive of the three vertebrate kidneys, active in the adults of some primitive fish (lampreys and hagfish), the embryos of more advanced ... [5 related articles]
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http://www.britannica.com/eb/a-z/p/120
1. The definitive excretory organ of primitive fishes. ... Synonym: head kidney. ... 2. In the embryos of higher vertebrates, a vestigial structure consisting of a series of tortuous tubules emptying into the cloaca by way of the primary nephric duct; in the human embryo, the pronephros is a very rudimentary and temporary structure, followed by the...
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http://www.encyclo.co.uk/local/20973
(pro-nef´ros) pl. proneph´roi a vestigial excretory structure developing in the embryo before the mesonephros; its duct is later used by the mesonephros, which arises caudal to it. the definitive excretory organ of primitive fishes.
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Pro·neph'ros Pro*neph'ron noun [ New Latin , from Greek ... before + ... a kidney.] (Anat.) The head kidney. See under Head .
Found on http://www.encyclo.co.uk/webster/P/173
Type: Term Pronunciation: prō-nef′ros, -roy Definitions: 1. The definitive excretory organ of primitive fishes. 2. In the embryos of higher vertebrates, a vestigial structure consisting of a series of tortuous tubules emptying into the cloaca by way of the primary nephric duct; in the human embryo, the pronephros is a very rudimentary an...
Found on http://www.medilexicon.com/medicaldictionary.php?t=72751
one of the three embryonic excretory organs of vertebrates, which becomes the functional kidney of certain primitive fishes. Cf.
Found on https://www.infoplease.com/dictionary/pronephros
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