B 



BOVINE OBSTETRICS 



plasia, hypertrophy, or both must take place. The outer" 

 layer of the uterus is formed by the serosa, which may be 

 considered of peritoneal origin. The part toward the ab- 

 dominal cavity is an endothelial layer; the layer below it is 

 united to the muscularis. The mnscularis is composed of two 



b 



Fig. 1. — Sexual Organs of the Cow. 

 a. Cavity of tho vulva; b. vagina; c, urinary meatus and iis valve: & canal- of 

 Gaertiicr: <, external os uteri; /, internal its uteri; i/, bo<ly of the uterus; 

 /,, empl 5 born ; t, broad Llgamenl ; /., ovary ; '. oviduct. 



layers, an outer or longitudinal one, an inner concentric or 

 circular one. The former is continued through the os uteri 

 into the vagina. During pregnancy the muscular elements of 

 the uterus increase in size. 



