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mesonephrosenUK
mes·o·neph·ros M0238500 (mĕz′ə-nĕf′rəs, -rŏs′, mĕs′-)n. 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. Also called Wolffian body.
[meso- + Greek nephros, kidney.]
mes′o·neph′ric adj.mesonephros (ˌmɛsəʊˈnɛfrɒs) n (Zoology) the middle part of the embryonic kidney in vertebrates, becoming the adult kidney in fishes and amphibians and the epididymis in reptiles, birds, and mammals. See also pronephros, metanephros[C19: New Latin, from meso- + Greek nephros kidney] ˌmesoˈnephric adjmes•o•neph•ros (ˌmɛz əˈnɛf rɒs, ˌmɛs-, ˌmi zə-, -sə-)
n., pl. -roi (-roi). an excretory organ of vertebrate embryos, developing into the functional kidney in fishes and amphibians and into part of the ducts and tubules of the reproductive system in reptiles, birds, and mammals. [1875–80; meso- + Greek nephrós kidney] mes`o•neph′ric, adj. MesonephrosenUK
mesonephros[¦mez·ə′ne‚frōs] (embryology) One of the middle of three pairs of embryonic renal structures in vertebrates; persists in adult fish and is replaced by the metanephros in higher forms. Mesonephros wolffian body, a paired excretory organ in vertebrates. The mesonephros consists of numerous twisting tubules that open at one end into the body cavity and at the other into the mesonephric (wolffian) duct. Each tubule has a lateral outgrowth —the malpighian corpuscle. In fish and amphibians, the mesonephros functions throughout life; in reptiles, birds, and mammals, including man, it functions only during the early stages of embryonic development, being subsequently replaced by the metanephros. At first the metanephros is metameric in structure, but this is lost as the organism grows. In the males of higher vertebrates, most of the mesonephros becomes an appendage of the testis and, with the wolffian duct, forms the vas deferens; in the females, the mesonephros is reduced. mesonephrosenUK
mesonephros [mez″o-nef´ros] (pl. mesoneph´roi) (Gr.) the excretory organ of the embryo, arising caudad to the pronephros and using its duct. adj., adj mesoneph´ric.mes·o·neph·ros, pl. mes·o·neph·roi (mez'ō-nef'ros, -roy), One of three excretory organs appearing in the evolution of vertebrates; in life forms with a metanephros, the mesonephros is located between the regressing pronephros and the metanephros, cephalic to the latter. In young mammalian embryos, the mesonephros is well developed and briefly functional until establishment of the metanephros, the definitive kidney; in older embryos, the mesonephros undergoes regression as an excretory organ, but its duct system is retained in the male as the epididymis and ductus deferens. Synonym(s): middle kidney, wolffian body [meso- + G. nephros, kidney] mesonephros (mĕz′ə-nĕf′rəs, -rŏs′, mĕs′-)n. 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. Also called Wolffian body.
mes′o·neph′ric adj.mesonephros The second stage in renal development, which follows the pronephros and precedes the metanephros/adult kidney. The mesonephros appears after the first embryologic month as an oblong mass that co-develops with the embryonal gonads and disappears with maturation; vestigial mesonephric tissue (wolffian duct) remnants are present in adults as efferent ductules in the testis, and tubules of epiphoron in women.mes·o·neph·ros, pl. mesonephroi (mez'ō-nef'ros, -roy) One of three excretory organs appearing in the evolution of vertebrates; in life forms with a metanephros, it is located between the regressing pronephros and the metanephros, cephalic to the latter. In young mammalian embryos, the mesonephros is well developed and briefly functional until establishment of the metanephros, the definitive kidney; in older embryos, the mesonephros undergoes regression as an excretory organ, but its duct system is retained in the male as the epididymis and ductus deferens.
Synonym(s): wolffian body. [G. meso- middle + G. nephros, kidney]mesonephros or Wolffian body the middle part of the embryonic kidney which in fish and amphibia is the functional kidney, but which gives rise embryologically to the tubules of the testis in mammals, birds and reptiles. See also WOLFFIAN DUCT.Wolff, Kaspar F., German embryologist in Russia, 1733-1794. wolffian body - one of three excretory organs appearing in the evolution of vertebrates. Synonym(s): canal of Oken; corpus of Oken; mesonephroswolffian cyst - a cyst lying in the broad ligaments of the uterus and arising from any mesonephric structures.wolffian duct - a duct in the embryo draining the mesonephric tubules. Synonym(s): mesonephric ductwolffian rest - remnants of the wolffian duct in the female genital tract that give rise to cysts. Synonym(s): mesonephric restwolffian ridge - one of the paired longitudinal ridges developing in the dorsal body wall of the embryo. Synonym(s): urogenital ridgewolffian tubules - Synonym(s): Kobelt tubulesmes·o·neph·ros, pl. mesonephroi (mez'ō-nef'ros, -roy) One of three excretory organs appearing in the evolution of vertebrates.
Synonym(s): wolffian body. [G. meso- middle + G. nephros, kidney] |