Mesonephric duct

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Mesonephric duct
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Urogenital sinus of female human embryo of eight and a half to nine weeks old.
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Transverse section of a chick embryo of forty-five hours' incubation.
Latin ductus mesonephricus; ductus Wolffi
Gray's p.1205
Carnegie stage 11
Days 28
Precursor intermediate mesoderm
Gives rise to vas deferens, seminal vesicles, epididymis
Code TE E5.6.2.0.0.0.4

The mesonephric duct (also known as Wolffian duct, archinephric duct, Leydig's duct and nephric duct) is a paired organ found in mammals including humans during embryogenesis. Wolffian structures are male urogenital structures that include the epididymis, vas deferens, and seminal vesicles that differentiate from this structure.

The mesonephric duct connects the primitive kidney, the mesonephros, to the cloaca and serves as the anlage for certain male reproductive organs.

Structure[edit]

The mesonephric duct connects the primitive kidney, the mesonephros, to the cloaca and serves as the anlage for certain male reproductive organs.

Development[edit]

Wolffian duct (red) degenerates in females (middle image) and develops in males (bottom).

In both the male and the female the Wolffian duct develops into the trigone of urinary bladder, a part of the bladder wall. However, further development differentiates between the sexes in the development of the urinary and reproductive organs.

Male[edit]

In a male, it develops into a system of connected organs between the efferent ducts of the testis and the prostate, namely the epididymis, the vas deferens, and the seminal vesicle. The prostate forms from the urogenital sinus and the efferent ducts form from the mesonephric tubules.

For this it is critical that the ducts are exposed to testosterone during embryogenesis. Testosterone binds to and activates androgen receptor, affecting intracellular signals and modifying the expression of numerous genes.[1]

In the mature male, the function of this system is to store and mature sperm, and provide accessory semen fluid.

Female[edit]

In the female, with the absence of anti-Müllerian hormone secretion by the sertoli cells and subsequent Müllerian apoptosis, the Wolffian duct regresses, and inclusions may persist. The epoophoron and Skene's glands may be present. Also, lateral to the wall of the vagina a Gartner's duct or cyst could develop as a remnant.

The derivatives of the mesonephric duct can be remembered using the mnemonic, "Gardener's SEED" for Gartner's duct, Seminal vesicles, Epididymis, Ejaculatory duct and Ductus deferens.[2]

Function[edit]

Sexual differentiation[edit]

History[edit]

It is named after Caspar Friedrich Wolff who described the mesonephros and its ducts in his dissertation in 1759.[3]

Additional images[edit]

See also[edit]

References[edit]

  1. ^ Hannema SE, Print CG, Charnock-Jones DS, Coleman N, Hughes IA (2006). "Changes in gene expression during Wolffian duct development". Horm. Res. 65 (4): 200–9. doi:10.1159/000092408. PMID 16567946. 
  2. ^ "Wolffian duct: Derivatives". LifeHugger. Retrieved 2009-12-12. 
  3. ^ synd/2845 at Who Named It?

External links[edit]