198 



ELEMENTS OF HISTOLOGY. [Chap. xxiv. 



free surface of the mucous membrane. The cavity of 

 the duct is continued as a very fine canal into the 

 neck and through the rest of the gland tube. Next 



Pig. 114 Peptic Glands. 



A, Under a low power ; d, duct ; n, neck ; B, part of the f undns of a gland 

 tube under a high power; p, parietal cells; c, chief cells. 



to the lumen is a continuous single layer of more or 

 less transparent, granular-looking, epithelial cells, 

 each with a reticulated protoplasm and a spherical or 

 slightly oval nucleus. In the neck these cells are 



