The Urinogenital System. 201 



(j) The round ligament dig. teres uteri) which may be traced 

 from the anterior end of the uterus to the body-wall below 

 the posterior portion of the inguinal ligament, where it is 

 inserted into a small peritoneal recess, the homologue of the 

 testis sac of the male. 



(k) The vagina is a flattened median tube with muscular walls; 

 it receives anteriorly the apertures of the right and left uteri. 



2. Preparatory to dissecting the urinogenital structures of the 

 pelvis, the median incision of skin of the ventral surface should be 

 continued backward to the base of the clitoris, the structure and 

 attachments of the latter being then examined as follows : 



(a.) The cavernous bodies (corpora cavernosa clitoridis) form 

 the body of the structure, as in the male, and are attached to 

 the posterior border of the ischium through short fibrous 

 cords, the crura clitoridis. 



(b) The suspensory ligament (lig. suspensorium clitoridis) is a 

 short median cord joining the base of the clitoris with the 

 posterior end of the symphysis. 



(c) The pubocavernosus and ischiocavernosus muscles pass 

 from the posterior border of the ischium to the base of the 

 clitoris on either side, the former being median in position. 



The attachments of the clitoris should be severed and the sym- 

 physis divided. By pressing apart the two sides of the pelvis the 

 urinogenital tube may be dissected out and removed, together with 

 the terminal portion of the rectum. 



The related structures, the middle haemorrhoidal artery, etc., appearing in 

 this dissection are as in the male (see note p. 198). 



In the urinogenital ducts, examine the extent of the vagina back- 

 ward and its connection with the canal of the bladder to form the 

 common vestibulum. The latter is comparable to the male 

 urethra (cf. p. 91, Fig. 48). The bulbourethral gland (gl. 

 bulbourethral) (cf. p. 199) lies on the dorsal wall. 



By slitting open the vestibulum and extending the incision into 

 the bladder and also forward into the left uterus the apertures of 

 these structures may be examined from the interior. There is an 

 external uterine aperture (orificium externum uteri) for each 

 division of the uterus. 



