THE STOMACH 



155 



PRACTICAL DEMONSTRATION 



Inasmuch as the human stomach cannot often be obtained until decompo- 

 sition has destroyed it for our work, we must secure the organ from some one 

 of the lower animals. The stomach of the dog presents all the histologTcaT 

 features of that of man, and can be obtained in good condition from an animal 

 recently killed. 



Harden small pieces in strong alcohol, and cut sections at a right angle to 

 the surface and from different regions. Stain with hsematoxylin and eosin, and 

 mount in balsam. 



VERTICAL SECTION OF WALL OF CENTRAL PORTION 



OF DOG ' S STOMACH 



103 ) 



OBSERVE: 

 (L.) 



1. The division into: (a) Surface epithelium (free ends of 

 gland-tubes). (&) Mucosa. (c) Muscularis mucosae. (cO Sub- 



FIG. 103. VERTICAL SECTION OP WALL OF CENTRAL PORTION OF DOG'S STOMACH. 



A. Internal surface, showing open mouths of the gastric tubules, lined with clear colum- 

 nar cells. 



B. Deepest portion of mucosa. (\ Muscularis mucosse. 

 D. Submucosa. E. Adipose tissue in last. 

 F. Bundles of muscular tissue (internal circular) (X 60). 



