B 



urachus (supporting ligament) 



seminal vesicle 

 ureter 

 VGS deferens 



ampulla 

 utriculus prostaticus 

 prostate gland 



Cowper's gland 



hilus (indented area) 

 renal artery and vein- 



pelvis- 



epididymis 

 processus vaginalis of young animal 



gubernaculum 



kidney 



seminal vesicle 



prostate gland 

 (bulbourethral gland). 



Cowper's gland 



suspensory ligament 

 vas deferens 



spermatic cord 



internal oblique muscle 



cremaster muscle 



corpus cavernosum penis 

 corpus cavernosum urethroe 

 lans 



Figure 10-31. Urogenital system of a mole mammal (man). A, semidiogrammatlc system as seen 

 from below (or in front); B, lateral view of bladder region showing interrelationships. 



The embryological development of the male system is in- 

 dicated in the above description and in the previous account 

 of the kidney. Not mentioned are other remnants of the 

 nephric ducts, the appendix of the epididymis and the par- 

 adidymis (Figure 10-32). 



MuUerian ducts are rudimentary in the male. The ante- 

 rior end remains as the hydatid appendix of the testis, while 

 a bit of the midline tubule, where it enters the urogential 

 sinus, remains as the prostatic utriculus. 



Mammals characteristically have the testes in a scrotum 

 outside the body cavity. The process of descent into the 

 scrotum in man involves movement posteriorly (toward the 

 caudal end) along the line of the genital ridge and between 

 the peritoneum (lining of the body cavity) and the body 

 musculature (Figure 10-33). This movement continues cau- 

 dally, then across the posterior wall of the body cavity, and 

 out through the muscular body wall at the inguinal canal 

 (Figure 10-31). In this emergence from the body cavity the 

 testis is accompanied by an outpocketing of the coelomic lin- 

 ing, the processus vaginalis. The testis carries strands of the 



appendix epididymis 



epididymis 



mesonephric tubule 

 ductus epididymidis 



ductuli efferentes 

 vas deferens 



rete testis in mediastinum 



ductus aberrans 



tunica albugineo 



seminiferous tubule paradidymis 



Figure 10-32. Testis tubules and connections with nephric duct in 

 man. (After Ham, 1957) 



THE REPRODUCTIVE SYSTEM 



319 



