THE UROGENITAL SYSTEM — EXCRETION AND REPRODUCTION 



567 



vaginalis, down with them, so, despite their superficial position, they 

 still protrude into a portion of the coelom. 



In man and other mammals in which spermatogenesis goes on 

 continually throughout adult life, the testes remain permanently de- 

 scended. But in most wild mammals spermatogenesis occurs only dur- 

 ing specific breeding seasons, and the testes descend only at this time. At 



Urete-rsn 



Urinary bla.d.de-r 



PeritoneaJ.- 

 cavity 



Se.mirLa.1 

 v<Z/Sicle 



Prosta.te 

 Re-ctum. 



Prostatic 

 utricle 



Cowpers gland 



Vas deferens &^^\^ 



Retc cords— ^'^^^'" 



Epididymis—^ /*^ 



Seminiferous-^ 

 tubulcS 



■Vks dz-f erons 



Pobis 



Cavernous 

 bodies 



Ui^cttira. 



GlaxiS penis 



-•otum 

 ■ Tunica vaginalis 



•-Testis 



Figure 28.4. A diagrammatic sagittal section through the pelvic region of a man 

 to show the genital organs. The prostatic utricle is a vestige of the oviduct that is 

 present in the sexually indifferent stage of the embryo. (Modified after Turner.) 



-Ovary 



Uterus 



CcrvL 



■Fallopian tube 



Peritoneal 

 cavity 



Urinary bladder 



Pubis 



Rectum 



Clitoris 

 -Labium majus 

 Labium minus 



Vadina — 



Urethra ' 



Figure 28.5. A diagrammatic sagittal section through the pelvic region of a 

 woman to show the genital organs. (Modified after Turner.) 



