pronephros

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pronephros

 [pro-nef´ros] (Gr.)
the primordial kidney; an excretory structure or its rudiments developing in the embryo before the mesonephros; its duct is later used by the mesonephros, which arises caudal to it.

pro·neph·ros

, pl.

pro·neph·roi

(prō-nef'ros, -roy),
1. The definitive excretory organ of primitive fishes. Synonym(s): 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.
[pro- + G. nephros, kidney]

pronephros

(prō-nĕf′rəs, -rŏs′)
n. pl. proneph·roi (-roi) or proneph·ra (-rə)
A kidneylike organ, being either part of the most anterior pair of three pairs of organs in a vertebrate embryo, disappearing early in the embryonic development of most vertebrates.

pro·neph′ric (-rĭk) adj.

pro·neph·ros

, pl. pronephroi (prō-nef'rŏs, -roy)
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 primordial nephric duct; in the human embryo, the pronephros is a very rudimentary, nonfunctional, and temporary structure, followed by the mesonephros and still later by the metanephros.
[pro- + G. nephros, kidney]

pronephros

the first excretory organ in the vertebrate embryo. Its duct (MULLERIAN DUCT) gives rise to the OVIDUCT in the female and degenerates in the male.