548 THE RABBIT 



CHAP. 



3 The common iliac arteries, each of which gives off an 

 ilio-lumbar branch and divides into an external and an 

 internal iliac, the former becoming continuous, beyond 

 Poupart's ligament, with the femoral. (The course of these 

 arteries and of the corresponding veins can be more easily 

 traced after the urinogenital organs have been removed 

 see IX.) 



4, The ilio-lumbar veins, and the trifurcatioh of the post- 

 caval into the external iliacs and a median vein formed by 

 the fusion of the two internal iliacs. 



Sketch all these vessels later, after the removal of the 

 urinogenital organs. 



VIII. Dissect away the peritoneum and fat from the 

 kidneys, ureters, and generative organs, and trace each 

 ureter from the hilus of the kidney backwards to the bladder, 

 which, if contracted, may be inflated from the urinogenital 

 aperture. Then make out 



A. In the male (Fig. 144, A) : 



1. The penis, with the prepuce, and the aperture of the 

 urinogenital canal or urethra, which latter is lined by the soft 

 corpus spongiosum, and strengthened by the corpora caver- 

 nosa, which diverge proximally and are attached to the 

 ischia. 



2. The scrotal sacs, each communicating with the abdo- 

 minal cavity by the inguinal canal, through which the 

 corresponding spermiduct and the spermatic artery and vein 

 pass to the spermary, to see which and the epididymis the 

 scrotal sac should be slit open along its ventral wall. (Sperms 

 should be examined from a fresh spermary compare p. 2 10.) 



3. The course of the spermiducts. 



B. In the female (Figs. 144, B, and 145) : 



1. The vulva; and the clitoris, with its corpora cavernosa, 

 on the ventral wall of the urinogenital canal. 



2. The vagina, uteri, and uterine tubes with their funnels. 



3. The ovaries, studded with ovisacs. 



IX. Dissect away the kidneys, ureters and in the male, 

 the scrotal sacs, in the female, the ovaries from the sur- 

 rounding parts : cut through the pelvic symphysis with a 

 knife, sever the attachment of the corpora cavernosa to the 

 ischia, and cut through the skin around the urinogenital 

 aperture and anus. Remove the whole of the urinogenital 

 organs, together with the posterior end of the rectum, from 

 the body and, after noting VII, 3 and 4, pin them out in 

 a dissecting-dish, with the ventral side uppermost, taking 



