AND ABDOMINAL VISCERA. 2/7. 
ee ie MALE REPRODUCTIVE ORGANS. 
Lf dissected upon a new dog, open the abdomen as tn 
the dissection of the abdominal 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 ¢wnzca vagenalzs. Within this lies a 
firm white sheath of connective tissue, the ¢zz2ca 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 zzguznal 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 open 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 Epipipymis is the enlarged por- 
