04 PRACTICAL MICROSCOPY. 



The several layers of the stomach may be better understood by ref- 

 erence to the diagram (Fig. 62). 



The gastric tubular glands are of two principal varieties, viz. : 1, 

 The peptic glands, found in the cardiac portion of the stomach; 2, 

 The pyloric glands, which occupy the pyloric extremit} 7 " of the organ. 

 The mucous membiane, midway between the cardiac and pyloric por- 

 tions, is occupied by tubules which partake of the character of both 

 peptic and pyloric glands, so that no sharp boundary line exists. 



The peptic or cardiac gland-tubes penetrate to the muscularis mu- 



FIG. 62. DIAGRAM OF THE WALL OF THE STOMACH IN VERTICAL SECTION. 



A. Layer of gastric tubules. 



B. Vascular portion of mucosa. 



C. Muscularis mucosae. 



D. Submucosa. 



E. Internal circular layer of muscular fibre. 



F. External oblique and longitudinal muscular layers. 



G. Peritoneum. 



I, I, I. Lumen of gastric tubules. 

 J, J. Branching gastric tubules. 



K, K. Blood-vessels arising from lower portion of mucosa, forming plexus 'between the 

 tubules. 



cosae. They pursue a somewhat wavy course, and at their lower or 

 blind extremity are frequently bifid. They are lined at their com- 

 mencement on the surface with translucent columnar epithelium, the 

 cells being polygonal in transverse section. As the fundus or bottom 

 of the tube is approached, the lining cells become granular, larger, 



