28 MUSCLES OF THE ABDOMEN 
tion lying in contact with the anterior end of the tes- 
tis. 
b. THe Caupa Epipipymis forms the posterior 
narrower portion. It is connected with the testis bya 
short ligament, the gudernaculum. 
4. The Vas Deferens—the narrow tube forming 
the continuation of the cauda epididymis. It passes 
along the spermatic cord, enters the abdomen, and 
finally opens into the urethra—as will be seen in the 
later dissection. 
5. The Spermatic Artery and Vein, found also in 
the spermatic cord. They supply the testis with blood. 
Cut through the pubis as directed tn the dtssection 
of the female organs. Ligature the rectum, and re- 
move wt tf not done wn the previous dissection. Clear 
away the fat, etc., from the neck of the bladder to the 
root of the pents. 
6. The Vas Deferens. After passing through the 
inguinal canal it turns inward to the dorsal sur- 
face of the neck of the bladder lying internal to the 
ureter, The two vasa deferentia open close together 
into the dorsal surface of the urethra a short distance 
beyond its origin from the bladder. 
7. The Prostate Gland is a large glandular mass 
encircling the urethra at the same point. Its ducts 
open into the floor of the urethra. 
8. The Urethra after leaving the prostate gland 
continues under the symphysis pubis to reach the 
penis. This portion is known as the urino-genital 
canal, and has very vascular walls. 
9. Cowper’s Glands are very small in the dog. 
Each opens into the urino-genital canal by a small 
duct as it passes under the symphysis. 
10. The Penis. At its root the lower aspect 1s 
