Mesonephros

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Related to mesonephric: metanephric, Mesonephric tubule

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 ?
Seminal vesicle cysts with unilateral renal agenesis and contralateral ureteral stenosis in a [beta]-thalassemic patient: an unknown association by incomplete development of the mesonephric duct.
Fate of a kidney-specific mesonephric antigen during the differentiation of the epididymis.
Ectopic ureters are always associated with a duplicated system--two ureteral buds exit from the mesonephric duct, and one ends up positioned ectopically.
Oncocytoma, papillary adenoma, mesonephric adenoma and angiomyolipoma are the main benign tumors in the kidney.
Zinner syndrome is a triad of mesonephric duct abnormality comprising of unilateral renal agenesis, ipsilateral seminal vesicle cyst, and ejaculatory duct obstruction.
Both of them are known to control the development of the central nervous system, eye, kidney, thyroid gland, organs deriving from the mesonephric (wolffian) duct, and those related to the miillerian duct.
Lhxl-null mice do not progress past mesonephric development (Shawlot and Behringer 1995).
The embryologic genesis of multiple pelvises is best described by one ureteral bud arising at the 5th week of embryological life from the mesonephric duct.
8days old showed that testis is located under mesonephric kidneys and adhered to its ventral surface.
The ureteral bud arises from the dorsal aspect of the distal mesonephric duct, which extends in a dorsocranial fashion to meet and induce differentiation of the metanephric blastema.
Testosterone maintains the mesonephric ducts and later causes the development of the accessory glands (seminal vesicle, prostate and paraurethral glands) and their connection to the urethra.