THE INTESTINE 



397 



has two layers of oblique, unstriped muscle-fibers, with a variable outer layer of 

 striped muscle continuous with that of the oesophagus. 



The muscular coat of the omasum consists of a thin external longitudinal layer 

 and a thick internal circular layer. At the omasal groove there is an additional 

 inner layer of longitudinal fibers. The laminse contain three muscular strata— a 

 central layer of vertical fibers, flanked on either side by a layer of longitudinal 

 fibers, which are continuous at the attached border with the muscularis mucosa. 



The muscular coat of the abomasum consists of longitudinal and circular 

 layers; the latter forms a well-developed pyloric sphincter. 



The mucous membrane of the first three divisions is destitute of glands, and 

 is covered with a thick, stratified, squamous epithelium; the superficial part of 

 the latter is horny, and is shed in large patches in the rumen and omasum. The 



Oesophagus 



Postern 

 blind sacs. 



Fig. 292. — Stomach op N?:w-born Calf, Rit;HT View. 

 The rumen is raised. 



corium (Tunica propria) is papillated. The mucous membrane of the abomasum 

 is glandular, and corresponds to that of the right sac of the stomach of the horse. 

 The short fundus glands occur in that part which presents the large folds, while 

 the long pyloric glands are found in the remainder, except about the omaso- 

 abomasal orifice, where cardiac glands occur. The mucosa of the fundus gland 

 region is very thin as compared with that of the horse. There is a round prominence 

 on the pyloric valve. 



THE INTESTINE 

 The intestine of the ox lies almost entirely to the right of the median plane, 

 chiefly in contact with the right face of the rumen. It is attached to the sublumbar 

 region by a common mesentery. 



