Mesonephros


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Related to Mesonephros: metanephros, mesonephric duct

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.

References in periodicals archive ?
of the proximal tubules of mesonephros decreased among the groups with significant difference between control group I and all the experimental groups.
The renal corpuscle and efferent epididymal ducts represent the remnant mesonephros that is modified for sperm transport.
So metanephros by its growth has been gone cranially and occupied front of atrophic mesonephros and testis were occupied in caudoventral part of abdominal cavity.
Pour sa part, l' endocrinon (systeme endocrinien) regroupe toutes les glandes a secretion interne plus les organes dits recapitulatifs de l'ontogenese: la chorde, les reins embryonnaires, le protonephros et le mesonephros.
1) In males, the left testicle, or other derivatives of the mesonephros, connect to splenic tissues, usually an accessory spleen.
At 17 days of age, the mesonephros, an early embryonic kidney, is a large organ consisting of a tight mass of convoluted tubules.
Lemly (2002) reported that Belews lake green sunfish that had accumulated high levels of Se showed that numerous tubular casts were present, and tubular epithelium was desquamated, vacuolated, and often destroyed (which can render the tubular system of the mesonephros incapable of functioning properly).
Parathion and Salinity effects on gills and mesonephros carbonic anhydrase activity of the fish Oreochromis hornomm.
The horizontal segment crossing anterior to the kidney can be assumed to be the persisting left post-subcardinal anastomosis connecting the posterior cardinal vein with the subcardinal vein anterior to the mesonephros.