AND ABDOMINAL VISCERA. 2J 



F. THE MALE REPRODUCTIVE ORGANS. 



If dissected upon a nezv dog, open the abdomen as in 

 the dissectio7i of tJie abdomi7ial viscera. Remove the 

 stomach, liver and intestines without disturbing the 

 urinary or reproductive organs. 



1. The Scrotal Sac is a pouch-like diverticulum 

 of the skin of the abdomen lying posterior to the 

 symphysis pubis. It contains the testes. 



2. The Testes. Dissect the skin from the scrotal 

 sac and the proximal half of the penis ; the two testes 

 will be exposed. Each is enclosed in a thin sheath of 

 peritoneum, the tunica vaginalis. Within this lies a 

 firm white sheath of connective tissue, the tunica al- 

 buginea, forming the proper capsule of the organ. At 

 the anterior end of each testis is the spermatic cord 

 enclosed in its sheath, and consisting of the spermatic 

 artery and vein and the vas deferens bound into one 

 cord. It may be followed forward to the abdominal 

 wall which it penetrates through an oblique opening, 

 the inguinal canal. Along the dorsal side of the 

 spermatic cord is a thin band of muscle fibres, the 

 cremaster muscle ; it arises from Poupart's ligament 

 at the symphysis and passes to the testes, over which 

 its fibres spread. 



Slit ope7i the tunic of the testis and spermatic cord. 



The testis will be fully exposed as an oval pinkish 

 body about an inch long (in small dogs), and sus- 

 pended by the spermatic cord. 



3. The Epididymis is an irregular convoluted mass 

 lying along the inner and dorsal border of the testis. 

 It is divisible into several portions. 



a. The Caput Epididymis is the enlarged por- 



