434 



Diseases of the Genital Organs 



calves (six weeks) the layers are very numerous, and in 

 some the mucosa is so thick that there is little or no space 

 between the individual folds and the lumen is narrowed 

 considerably, as in Fig. 142. The muscular wall is formed 

 of two layers of smooth fibers, a broad, inner, circular, and 

 a thin, outer, longitudinal layer. A third inner layer of lon- 

 gitudinal fibers and bundles is seen in most sections, espec- 

 ially near the uterine end, either as a distinct layer or in 

 crescent-shaped bundles, as in Fig. 144. 



Fig. 144- -Chronic Catarrhal Salpingitis, with a Distinct Crescent- 

 Shaped Inner Longitudinal Muscular Coat. 



So far as known, all inflammatory changes in the oviducts 

 are due to bacterial invasion. In the milder forms of sal- 

 pingitis the mucosa alone is affected ; in the severer types the 

 process spreads to the deeper layers and even to the serosa. 

 In the former case there is congestion, some exudation into 

 the basement membrane, local loss of cilia, and frequently 

 more or less desquamation of the superficial epithelium. In 

 the deeper layers there may be hyperaemia, slight exudation 



