456 



THE DIGESTIVE APPARATUS IN MAMMALIA. 



the oesophagus, when, in pulling back the wire, this extremity is drawn towards tlie pylorus, 

 and by careful traction the latter is so dilated as to allow the passage of the cardiac end, and 

 complete eversion of the stomach. Inflation will then give it its normal form and disposition? 

 with this difference, that the mucous membrane is external, and the serous tunic internal. 



Lastly, to render the muscular layers of the stomach more evident, it is advisable to plunge 

 the organ into boiling water for some minutes, after which it should be put into cold water. 

 If it is desired to study the external and middle layers, the stomach should be inflated, and its 

 serous covering removed by strips with foiceps and the fingers; if the deep layer is to be 



examined, the mucous membrane must be removed oy means of the forceps and scalpel from 

 a stomach previously everted. 



Situation. — The stomach, also designated the ventriculus, is situated in the 

 diaphragmatic region of the abdomen, where it has a direction transverse to 

 the median plane of the body. 



Dimensions. — Its average capacity, in an ordinary-sized Horse, is from 3 to 3^ 

 gallons ; but it varies greatly according to the bulk of the animal, its breed, and 



