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 

 ^^li^ffiilare 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; N, 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.) 



m 



m 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- 



