Mesonephros definition

mĕzə-nĕfrəs, -rŏs, mĕs-
The second of the three excretory organs that develop in a vertebrate embryo, becoming the functioning kidney in fish and amphibians but replaced by the metanephros in higher vertebrates.
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The excretory organ serving as the adult kidney of fishes and amphibians and as the embryonic kidney of higher vertebrates: the mesonephros and its duct develop into the epididymis and vas deferens in higher vertebrates.
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The second of the three excretory organs that develop in a vertebrate embryo, becoming the functioning kidney in fish and amphibians but replaced by the metanephros in birds, reptiles, and mammals.
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(biology) The second of the three excretory organs of the developing embryo; the Wolffian body.
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Other Word Forms

Noun

Singular:
mesonephros
Plural:
mesonephroi

Origin of mesonephros

  • meso– Greek nephros kidney

    From American Heritage Dictionary of the English Language, 5th Edition

Mesonephros Sentence Examples

  • The more complete replacements, such as the nephridia of the genital segment of Tubifex by a subsequently formed genital duct, may be compared with the succession of the nesonephros to the pronephros in vertebrates, and of the metanephros to the mesonephros in the higher vertebrates..

  • From the adjacent mesonephros cords of cells grow into the attached part of the genital ridge, or testis, as it now is, and from these the rete testis is developed.

  • Recent research, however, points to these cords of the rete testis et ovarii as being derived from the coelomic epithelium instead of from the mesonephros.

  • Lying dorsal to the genital ridge in the intermediate cell mass is the mesonephros, consisting FIG.

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Words near mesonephros in the Dictionary