170 



THE ESSENTIALS OF HISTOLOGY. 



termed the chief cell* of the cardiac glands, or, from their relative 

 position in the tubule immediately surrounding the lumen, the central 

 cells. Scattered along the tubule, and lying between the chief cells 

 and the basement-membrane, are a number of other spheroidal or 

 ovoidal cells, which become stained by logwood and other reagents 

 more darkly than the central cells. These are the superadded or 

 parietal cells (oxi/ntic cells 1 of Langley). Each parietal cell is surrounded 



FlG. 200. A CARDIAC GLAND 

 PREPARED BY GOLGl'S METHOD, 

 SHOWING THE MODE OF COM- 

 MUNICATION OP THE PARIETAL 

 CELLS WITH THE GLAND-LUMEN. 



(E. Midler.) 



FlG. 201. A PYLORIC GLAND, 

 FROM A SECTION OF THE 



DOG'S STOMACH. (Ebstein.) 



m, mouth ; n, neck ; tr, a deep por- 

 tion of a tubule cut transversely. 



by a network of fine passages, communicating with the lumen of the 



gland by a fine canal, which passes between the central cells (fig. 200). 



In the pyloric glands (fig. 201) the ducts are much longer than in 



the cardiac glands, and the secreting tubules possess cells of only one 



1 So called because they produce the acid of the gastric secretion. 



