346 VETERINARY PHYSIOLOGY 



Vomiting in the horse seldom occurs. The CBSophagus 

 joins the stomach very obliquely and folds of mucous mem- 

 brane of the stomach tend to prevent the passage of stomach 

 contents back into the oesophagus. Further, the lumen of 

 the oesophagus is diminished at the cardiac end, and there 

 the circular coat is thicker and firmer. On the few occasions 

 when vomiting does occur the vomited material, which is 

 prevented from entering the mouth by the long soft palate, 

 escapes from the nostrils (fig. 158). 



