168 



ELEMENTARY PHYSIOLOGY. 



[XVI. 



c. The submucous coat of connective tissue. 

 If the mucous membrane is in folds the sub- 

 mucous but not the muscular coat will be 

 seen to run up in the folds. 



d. The muscularis mucosae, or thin stratum 

 of unstriated muscle fibres a little below the 

 glands, this is divided more or less distinctly 

 into an outer longitudinal and an inner 

 circular layer. 



e. The mucous coat. Note in this 



The gastric glands with their openings and 

 the ridges between the openings. The 

 bifurcation of some of the glands may pro- 

 bably be made out. 



2. Observe under a high power 



a. The columnar mucous cells, lining the 

 'mouths of the glands and covering the free 



surface of the gastric mucous membrane 

 between the glands; they are long slender 

 cells becoming shorter in passing down the 

 mouths of the glands ; the upper third of 

 the cell is usually much more transparent 

 than the remaining portion, and the nucleus 

 lies at about the lower third. These cells 

 may have become detached if the tissue has 

 not been removed from the animal soon after 

 death. 



b. The large deeply stained ovoid or border 

 cells with ovoid nuclei, and the short columnar 

 or polyhedral central cells with spherical 



