This continues to grow caudalward until it opens into the ventral part of the cloaca; beyond the pronephros it is termed the Wolffian duct.
12.
In the sexually undifferentiated embryo, testosterone stimulates the development of the Wolffian ducts, the penis, and closure of the labioscrotal folds into the scrotum.
13.
The M�llerian ducts end in an epithelial elevation, the M�llerian eminence, on the ventral part of the cloaca between the orifices of the Wolffian ducts.
14.
On the medial side of the Wolffian duct, from the sixth cervical to the third lumbar segments, a series of tubules, the Wolffian tubules, develops.
15.
In the female, with the absence of anti-M�llerian hormone secretion by the Sertoli cells and subsequent M�llerian apoptosis, the Wolffian duct regresses, and inclusions may persist.
16.
One end grows toward and finally opens into the Wolffian duct, the other dilates and is invaginated by a tuft of capillary bloodvessels to form a glomerulus.
17.
The Wolffian duct forms the epididymis, vas deferens, ductus deferens, ejaculatory duct, and seminal vesicle in the male reproductive system and essentially disappears in the female reproductive system.
18.
This structure is derived from the Wolffian duct ( Mesonephric Duct ) as opposed to the appendix testis which is derived from the M�llerian duct ( Paramesonephric Duct ) remnant.
19.
If these cells can recognize testosterone, male development proceeds by prompting the female-forming structures, known as mullerian ducts, to degenerate and the male-forming structures, called wolffian ducts, to differentiate into the organs and ducts needed for male development.
20.
The pronephros disappears very early; the structural elements of the mesonephros mostly degenerate, but the gonad is developed in their place, with which the Wolffian duct remains as the duct in males, and the M�llerian as that of the female.
