28 MUSCLES OF THE ABDOMEN 



tion lying in contact with the anterior end of the tes- 

 tis. 



b. The Cauda Epididymis forms the posterior 

 narrower portion. It is connected with the testis by a 

 short ligament, the gubernaculuni. 



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 in the dissection 

 of the female organs. Ligature the rectum, and re- 

 move it if not done in the previous dissection. Clear 

 away the fat, etc., from the neck of the bladder to the 

 root of the penis. 



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 is 



