86 PRACTICAL MICROSCOPY. 



The remainder of the stomach has little special interest for the 

 histologist. The muscular portion of its walls consists of a thin 

 internal circular layer, with oblique bundles interspersed, and a thin 



FIG. 64. VERTICAL SECTION OF TORTUOUS AND BRANCHING TUBULAR GLAND, FROM PYLORIC 

 MUCOSA OF STOMACH. DIAGRAMMATIC. 



A. Lumen. This is often much widened. 



B. Duct portion of tubule. 



C. Branching glandular portion. 



D. Transverse section of the last. 



E. Lower limit of mucosa. 



external longitudinal layer of the involuntary variety. Between the 

 two layers is found a plexus of non-medullated nerves, corresponding 

 to the plexus of Auerbach of the intestines, but which is not demon- 

 strable by ordinary methods or sections. 



The blood supply is received at the curvatures. Branches pene- 

 trate the muscular layers along the lines of omental attachment, as 

 blood-vessels never penetrate the peritoneum. 



The peritoneum is constructed mainly of fibrous tissue, with an 

 external investment/ of pavement epithelium. 



PKACTICAL DEMONSTKATION. 



Inasmuch as the human stomach cannot often be obtained until 

 decomposition 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 histologies! features of that of man, and can be gotten 

 in good condition from an animal recently killed. 



