110 ANIMAL PHYSIOLOGY. 
In the male the Wolffian duct persists as the vas deferens ; 
in the female it remains as a rudiment in the region near the 
ovary (hydatid of Morgagni). In the female the Miillerian 
duct becomes the oviduct and related parts (uterus and vagina) ; 
in the male it atrophies. One, usually the right, also atrophies 
in female birds. The sinus pocularis of the prostate is the rem- 
nant in the male of the fused tubes. 
The various forms of the generative apparatus derived from 
the Millerian ducts, as determined by different degrees of fu- 
sion, etc., of parts, may be learned from the accompanying 
figures. 
In both sexes the most posterior portion of the Wolffian 
duct gives rise to the metanephros, or what becomes the perma- 
nvco ih 
Fig. 129.—Diagram of the mammalian tye ot female sexual is ei (after Quain). The dotted 
lines in one figure indicate functional ans in the other. C, beer of Bartholin (Cowper's 
gland); c.c, corpus cavernosum clitoridis ; dG, remains of the left Wolffian duct. which 
may ia as the duct of Gaertner; f, abdominal opening of left Fallopian tube; g, 
round ligament (corresponding to the gubernaculum) ; h, hymen ; i, rectum ; 1, labium ; 
m, cut Fallopian tube (oviduct, or Miillerian duct) of the right side; x, nympha; 0, left 
ovary ; po, parovarium ; sc, vascular bulb or corpus spongiosum ; u, uterus; v, vulva; 
va, vagina; W, scattered remains of Wolffian tubes (parodphoron) ; w, cut end of van- 
ished right Wolffian duct ; 3, ureter; 4, bladder passing below into the uretha; 5, urachus, 
or remnant of stalk of allantois. . 
nent kidney and ureter; in the male also to the vas deferens, 
testicle, vas aberrans, and seminal vesicle. 
The ovary has a similar origin to the testicle; the germinal 
epithelium furnishing the cells, which are transformed into 
Graafian follicles, ova, etc., and the mesoblast the stroma in 
which these structures are imbedded. 
In the female the parovarium remains as the representative 
of the atrophied Wolffian body and duct. 
The bladder and urachus are both remnants of the formerly 
extensive allantois. The final forms of the genito-urinary or- 
