Mesonephric duct

The mesonephric duct (also known as the Wolffian duct, archinephric duct, Leydig's duct or nephric duct) is a paired organ found in mammals including humans during embryogenesis. Male urogenital structures that arise from the mesonephric duct include the epididymis, vas deferens, and seminal vesicles.
The mesonephric duct connects the primitive kidney, the "mesonephros", to the cloaca and serves as the anlage for certain male reproductive organs.
Structure.
The mesonephric duct is a structure in the embryos of mammals including humans, that connects the primitive kidney, the mesonephros, to the cloaca and serves as the anlage for certain male reproductive organs.
Development.
In both the male and the female the mesonephric 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.
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.
In the mature male, the function of this system is to store and mature sperm, and provide accessory semen fluid.
Female.
In the female, with the absence of anti-Müllerian hormone secretion by the Sertoli cells and subsequent Müllerian apoptosis, the mesonephric duct regresses, although 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.
History.
It is named after Caspar Friedrich Wolff who described the mesonephros and its ducts in his dissertation in 1759.