FEMALE URETHRA. 



263 



part of the more highly developed corpus cavernosum urethrae of the male. 

 (Compare with Fig. 322, p. 283.) The muscularis consists of inner lon- 

 gitudinal and outer circular smooth muscle fibers, among which the veins 

 extend. Connective tissue with many elastic fibers is abundant in the 

 muscularis. The striated constrictor urethrae is outside of the smooth 

 muscle layer, as shown in the figure. 



FIG. 298. CROSS SECTIOM OF THE FEMALE URETHRA. (Koelliker). 



d., Gland-like diverticulum; e., epithelium; L., lumen of the urethra; m., striated muscle; s., corpus 

 spongiosum, containing venous spaces, v., and smooth muscle. 



MALE GENITAL ORGANS. 



DEVELOPMENT. 



The Wolman body becomes an important part of the male genital 

 organs and its duct serves to transmit the products of the testis to the 

 urogenital sinus. Another duct, parallel with the Wolffian and close 

 beside it, develops later, and is called the Mullerian duct. It arises as 

 an inpocketing of the coelomic epithelium near the anterior end of the 

 Wolffian body. The orifice into the peritoneal cavity becomes surrounded 

 by irregular folds known zsjimbriae. As the Mullerian duct grows poste- 



