Wolffian Duct

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Wolffian duct

[′wu̇l·fē·ən ′dəkt]
(embryology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Wolffian Duct

 

(from the name of the naturalist K. F. Wolff), tubule of the primary or truncal kidney, the mesonephros (Wolffian body). It develops in almost all vertebrates from the rudiment growing from the head kidney, the pronepriros, to the cloaca. The Wolffian duct appears to be formed metamerically only in elasmobranch fishes. In the embryos and larvae of bony fishes and amphibians, the Wolffian duct is the excretory duct of the pronephros and mesonephros, but only of the mesonephros in sexually mature females. In male amphibians, a connection forms between the testis and Wolffian duct; the latter functions simultaneously both as a ureter and as a sperm duct. In reptiles, birds, and mammals, due to the appearance of the pelvic kidney, the metanephros with a secondary ureter, the Wolffian duct functions only in the early stages of development, after which it becomes just a sperm duct in males and degenerates in females.

REFERENCE

Potemkina, D. A. “O sposobe obrazovaniia vol’fova protoka u amfibii.” Dokl. AN SSSR, 1951, vol. 80, no. 2.

D. A. POTEMKINA

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
A new species of Dero (Allodero) (Naididae: Oligochaeta) inhabiting the Wolffian ducts of the green tree frog (Litoria caerulea) in Queensland.
A mutation in the HSD17B3 gene blocks the synthesis of testosterone in the fetal testis resulting in normal male Wolffian duct structures but with female external genitalia at birth.
The Wolffian conception was well-suited to autocracy, whether in Wolff's native Prussia or 18th-century Russia, and Berest details how it shaped the teaching of natural law at the Russian Academy of Sciences and Moscow University.
Wolffian ducts develop from the mesonephric kidney system (mesoderm), which leads to the development of uterus and upper vagina.
In this way, while The Years "appears at first a retrogressive move" by an author who has primarily been celebrated as a stylistic innovator, Garrington argues that Woolf's seemingly conventional novel is shaped "at the deepest level" by the Wolffian "science" of hand-reading (123, 126).
Embryonic accessory ducts including Wolffian and Mullerian duct can also be observed in male and female embryos, respectively.
For a long period, Mendelssohn has been considered either by historians of philosophy as a Wolffian and popular philosopher missing Kant's critical philosophy standards or by scholars of Jewish Studies as the great reformer, although often with a critical undertone for an alleged tendency of assimilation.
Herder's invectives were directed against the discourse of Wolffian dogmatism [Schulphilosophie] with its rationalist generalizations and tautological explanations.(61) Kant, albeit also opposed to the assumptions of Schulphilosophie, nevertheless follows this tradition in so far as he attempts to establish a universal truth that he can formulate in abstract, general terms.(62) While both make human experience the mother of all knowledge, Herder also believes in a divine, rational order of the universe that can be discovered through the senses.
Here's a sample entry: "Wolffian ducts: also called mesonephric ducts; paired ducts that develop during vertebrate development; in human males, they give rise to the vasa deferentia, and in human females, they are relatively undeveloped.
Gupta and Das postulated that adherence and fusion of the developing wolffian ducts takes place early and that descent of one testis causes the other one to follow it toward the same hemiscrotum.
Ret receptors are first expressed in the Wolffian duct at gestational day 8-11.5 and as ureteric arborization proceeds(gestational days 13.5-17.5) 'Ret' is expressed in ureteric bud tip cells (Pachnis et al., 1993).
Adhesion or fusion of developing Wolffian ducts, defective development of ipsilateral gubernaculum, testicular adhesion, defective formation of the internal inguinal ring, traction on a testis by persistent Mullerian structures and possibility of the development of both testes from the same germinal ridge, are various postulated theories for the ectopic testis.