Dictionary » P » Pronephros

Pronephros

pronephros

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 mesonephros and still later by the metanephros.

Synonym: forekidney, primordial kidney.

Origin: pro-_ G. Nephros, kidney


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nephridia vs kidney

... nephridia. You find them at some invertebrates(planaria, earth worm, moluscs-but here they are modified metanephridia called the Bojanus organs). pronephros is the first evolutionary stage of the vertebrate kidney. You find in Agnatha. By the way, nephridiopor is the orifice that the metanephridia ...

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by thecow135
Sat Nov 05, 2005 11:07 pm
 
Forum: Zoology Discussion
Topic: nephridia vs kidney
Replies: 11
Views: 10337

nephridia vs kidney

... nephridia. You find them at some invertebrates(planaria, earth worm, moluscs-but here they are modified metanephridia called the Bojanus organs). pronephros is the first evolutionary stage of the vertebrate kidney. You find in Agnatha. By the way, nephridiopor is the orifice that the metanephridia ...

See entire post
by MrMistery
Fri Oct 14, 2005 5:32 pm
 
Forum: Zoology Discussion
Topic: nephridia vs kidney
Replies: 11
Views: 10337


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