ioo Diseases of tlie Genital Organs 



After a cow has been pregnant, increasing with each preg- 

 nancy, the relations of the cervical tissues become modified. 

 The second annular fold of the cervical mucosa becomes en- 

 larged, both elongated and thickened, and the antero-poste- 



Fig. 39— Instruments for the Examination of the Genitalia of Cows. 



/, 20" uterine forceps ; ■?, Palmer's uterine dilator, modified ; .,, Bo/.eman's 



uterine dressing forceps ; /, small uterine catheter. 



rior grooves become comparatively deeper, cutting the ring 

 into a series of deep, pedunculated lobes. Eventually these 

 push their way out through the vaginal ring or os uteri ex- 

 ternum into the vagina. The vaginal ring now serves as a 

 band surrounding the protruding second ring. The second 

 ring then becomes the most posterior portion of the cervix. 



