MORPHOLOGY 0^^ THE HUMAN . UEINOGEXITAL TRACT. o57 



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p. — The ultimate development of the urinogenital organs in 

 the male.and female trad: the male and female analogues. 



In the fcetus, whatever be its sex, we have a double set of 

 organs, viz., pronephros and mesonephros, with the mesonephric 

 or AYolffian duct and the Miilleriun ducts. We have now to 

 discuss the ultimate development of these in the two sexes, and 

 to state the analogous parts (fig. 34). 



In the human female the Miillerian ducts form the Fallopian 

 tube, uterus, and vagina, according to the generally accepted 

 view. 



From what I have already advanced, I regard this as only 



in part correct, and would modify it as follows. The Fallopian 



tubes, uterus, and upper two-thirds of the vagina are ::\Iiillerian, 



the lower third of the vagina is blended urinogenital sinus and 



Wolffian ducts. The hymen is developed from the lower ends 



of tlie AVolffian ducts. Inasmuch, therefore, as the hymen is 



developed from the Wolffian bulbs, as I have already indicated, 



it is evident that the hymen corresponds with the lower ends of 



the vasa deferentia in the male, and this gives us a most valuable 



point of comparison between the male and female urinogenital 



tracts. Hitherto there has been a want of exactitude in our 



knowledge, owing to the belief that the Wolffian ducts in the 



female disappeared in their lowest parts, and were therefore 



practically not represented in the female genital tract. In 



investigating this point I examined serial sections of male 



pelves between the second and third month, at the third and a 



half month, at the fourth month, and at the fourth and a half 



month. The following were the conditions found : — 



{a) The apparent uterus masculinus at the second and third 

 month is really due to fusion of the vasa deferentia. 



(&) At the fourth month the prostatic gland had developed, 

 (c) At the fourth and a half month I found, near the termina- 

 tion of the vas deferens, a hitherto undescribed bulb of epithelium 

 exactly like the Wolffian bulb of the female. It is remarkable 

 indeed to note this bulb in the male with epithelial cells exactly 

 like those of the adult vaginal mucous membrane. Tlie vas 

 deferens ended near, but not in it, in this specimen. 



{d) The so^called sinus pocularis in the adult male seems to 



VOL. XXXV. (n.S. vol. XV.) — APRIL 1901. 2 A 



