'Pronephros' the most primitive of the three
excretory organs that develop in
vertebrate, corresponding to the first stage of
kidney development.
The pronephros develops in the anterior
nephrotomes of all vertebrates. It is a paired organ, consisting of a series of
nephrons filtering
urine from both the
pericardium fluids via openings called
nephrostomes and blood from the
glomerulus.
The organ is active in adult forms of some primitive
fish, like
lampreys or
hagfish. It is present at the embryo of more advanced fish and at the
larval stage of
amphibians. In
human beings, it is rudimentary, appears at the end of the third week (day 20) and replaced by
mesonephros after 3.5 weeks.
See also
★
Mesonephros
★
Metanephros
External links
★
Overview at uoguelph.ca
★
Diagram at xenbase.org
★
Development of the pronephros in zebrafish
★
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