Examination of the Cervical Canal 101 



and in disease may project three to four inches beyond the 

 original os uteri externum toward the vulva. In severe dis- 

 ease the third annular fold may also force its way out 

 through the vaginal ring. In disease these everted, swollen 

 rings of cervical mucosa constitute large, cauliflower-like 



Fig. 40 -Median Longitudinal Sections of Cervices of Cows 



showing the Windings of the Cervical Canal. 



/, The vagina ; 2, lip of the os uteri externum ; 3, first annular mucous fold ; 



7, second annular mucous fold. 



tumors. The healthy mucosa of the cervix is smooth, of a 

 pinkish hue, paler than the vaginal mucosa. Its surface is 

 moist, but should reveal no signs of pus. During estrum the 

 cervical canal is dilated and filled with clear, highly lubri- 

 cant mucus. 



The deeper portions of the cervical canal may be examined 



