DIGESTION 



175 



Fig. 64 are shown the parts of the human stomach according to 

 modern nomenclature. To the left of the figure is seen the 

 antrum pylori, marked off by a fissure, IA, and a transverse 

 band for the main body of the organ. The main body is divided 

 into fundus and pre- 

 pyloric region ; it will 

 be observed that the 

 position assigned to 

 the fundus of the 

 human stomach is not 

 that found in the 

 horse. On the other 

 hand, the antrum py- 

 lori of the horse is as 

 well marked as in the 

 human, possessing 

 both the transverse 

 band and the saccu- 

 lated condition to- 

 wards the duodenum. 



A very remarkable 

 amount of mucin is 

 secreted by the villous 

 sac of the stomach, 

 and forms over the 

 inner surface of the 

 viscus a thick [gelat- 

 inous, firmly adherent 

 coating like white of 

 egg, which cannot be 

 washed away even by 

 a powerful jet of water. 



The pyloric orifice 

 of the stomach is usu- 

 ally large and open, 

 and there is a distinct 

 pyloric ring ; behind 

 this the duodenum is 

 dilated, and the gut 

 comports itself in such 

 a singular manner (which has a very important bearing on the 

 pathology of the organ) that mention must be made of it here. 

 From the pylorus the duodenum curves down and then up again, 

 forming a letter U ; so much does this remind one of a well-known 

 form of trap used in drainage, that we have described it as the 

 syphon trap of the duodenum (Fig. 65). The use of this trap 



a, 



Fig. 63. — Position of the Stomach op the 

 Horse in the Living Animal (after Ellen- 

 berger and baum). 



Vertical transverse section of the frozen body 

 made through the fourteenth dorsal vertebra, 

 showing the position occupied by the stomach ; 

 c , oesophagus ; d, duodenum ; a, cuticular 

 area ; b, villous area. As a perfectly vertical 

 section would not give a complete picture 

 of the stomach, owing to its obliquity, the 

 above has been schematically amended. The 

 observer is looking towards the animal's head. 



