MORPHOLOGY OF THE HUMAN URINOGENITAL TRACT. 353 



TI. The Analogues in the Male and Female Genital 



Tract. 



While it is generally believed that the analogy between the 

 male and female genital tract is a very close one, the exact 

 details have by no means been worked out, and excellent 

 observers are at variance on several points. 



Exact analogues have yet to be determined in regard to 

 those organs which are rudimentary in the one sex and fully 

 developed in the other. Thus it is as yet disputed how far the 

 vas deferens of the male is represented in the female ; how 

 much of the vagina is represented in the male, and so on. This 

 practically means that we must consider not only the adult 

 anatomy of the genital organs, but also their development, and 

 this resolves itself, in the main, into a consideration of the 

 development of the urinogenital organs. I shall therefore con- 

 sider the subject as follows : — 



A. The development, immediate and ultimate, of the urino- 



genital organs so far as known in man. 



B. The sig7iifcance of the temporary development of the Wolffian 



todies in the human embryo. 



C. The tdtimate fate of the urinogenital organs in the male and 



female; the male and female analogues. 



D. The homology of the male and female sexual function. 



A. — The develojjment, immediate and ultimate, of the urinogenital 

 organs, so far as is knoivn, in man. 



The development of the rectum, bladder, and urethra has been 

 considered in a previous section (pp. 332-335), and we have 

 therefore only now to take up the development of the Wolffian 

 bodies and ducts, and of the Milllerian ducts in the early stages. 

 On this part of our subject there is a very large amount written, 

 and what I give here is based on this and on my specimens at 

 the fourth and sixth week. These were examined by serial 

 sections. 



If we take a five weeks' embryo, as Coste so beautifully 

 figures, we find that in the pleuro-peritoneal cavity the tem- 

 porary organs known as the Wolffian bodies have developed. 



