THE DIGESTIVE SECRETIONS 



919 



together by slight amounts of reticular tissue. In between these 

 glands are found columnar goblet cells which secrete mucus. The 

 former consist of a basement membrane which is covered externally 

 with epithelium. Toward the gastric surface the enlarged outer 

 portions of these tubules narrow into a duct which is lined by short 



columnar cells. In many cases the latter 

 S&jl are mucus-secreting, the same as those 

 situated directly upon the inner surface of 

 the mucosa. The epithelium of the outer 

 portions of these tubules differs somewhat 



FIG. 493. FIG. 494. 



FIG. 493. DIAGRAMMATIC REPRESENTATION OF A FUNDIC GLAND. 



C, Chief cells ; P, parietal cells; D, duct of gland; A r , neck of gland. 



FIG. 494. PART OF TUBULE OF A FUNDUS GLAND, WITH THE LUMEN AND SECRETORY 

 CANALICULI STAINED BLACK ; THE GLAND-CELLS ARE ALSO SHOWN. 



C, Chief or central cells; p, parietal or oxyntic cells; I, lumen of tubule prolonged 

 into arborescent canaliculi which penetrate to the parietal cells. (Zimmermann.') 



in different parts of the stomach, so that we are able to recognize 

 three distinct types of gastric glands, namely: 



(a) The glands of the cardiac end, which are simple tubular or tubulo-racemose 

 in character and are lined by short columnar cells containing much granular mate- 

 rial. They are few in number and are found principally in the immediate vicinity 

 of the esophageal-gastric junction. 



(b) The glands of thefundus, which are distributed throughout the remaining 

 portion of the cardia and the entire fundus. They consist as a rule of three 

 or four long tubular glands which unite into a short duct. The low columnar 

 cells lining these ducts gradually pass over into the true secretory cells which are 

 somewhat polyhedral in shape and are partly filled with granules occupying a posi- 



