CHAPTER XL VI 

 DIGESTION IN THE STOMACH 



ON anatomical and physiological grounds this organ is divided 

 into three divisions namely: 



1. The fundus, or the reservoir. 



2. The cardia or body, or the digestive chamber. 



3. The pylorus, or the churn or mill. 



A schematic outline of the organ is shown in Fig. 194. The 

 normal position in man in the vertical position is seen in Fig. 195. 

 It is to be noted that it reaches to the umbilicus (U). 



The fundus may be regarded in animals as being separated from 

 the cardia by an imaginary line passing from the cardiac orifice to 

 the opposite point on the greater curvature; in 

 man, by the part lying above the horizontal plane 

 of the cardiac orifice. 



The incisura angularis, I. A., denotes the point 

 of demarcation between the body or cardia and 

 the pyloric portion. This portion itself is divisible 

 into two parts the pyloric vestibule and the 

 pyloric canal. The vestibule lies between the 

 incisura angularis and the pyloric canal. The 

 canal is the tube-like portion of the pylorus which 

 leads from the vestibule to the pyloric sphincter. 

 The stomach wall consists of three muscular 

 coats, arranged from outside inwards in longi- 



tudinal, circular, and oblique fashion. The longi- 



' . T, , ,, 



tuclmal are continuous with those ot the oeso- 



phagus, and radiate over the stomach, to end at the 

 pylorus. The circular fibres completely invest 

 the whole stomach, being particularly well marked 

 in the pyloric portion, especially at the pyloric sphincter. They also 

 form a well-marked thickening at the incisura angularis, termed the 

 " transverse band." The oblique fibres, starting as two strong bands 

 irom the left of the cardiac orifice, pass along the anterior part of the 

 dorsal and ventral surfaces towards the pylorus, gradually disappearing 

 as they go. 



The structure of the glands varies in the different portions of the 



379 



STOMACH. (Cannon.) 



K fu f dus; 



B, body; P, pylorus; 



jj t incisura angu- 

 laris ; PC, pyloric 

 canal - 



