240 



STRUCTURE OF THE STOMACH. 



beset with small irregular depressions or pits (fig. 179). Throughout its entire extent it is 

 covered by a single layer of moderately tall, narrow, cylindrical epithelium, which seems to 



consist of mucus-secreting goblet-ceUs (fig. 178). The 

 epithelium is sharply defined at the cardia from the 

 stratified epithelium of the oesophagus, and also at the 

 pylorus, from the true cylindrical epithelium with the 

 striated disc in the duodenum. [The cells contain a 

 plexus of fibrils, and in the passive condition seem to 



Serosa. 



Fig. 177. Fig. 179. 



Fig. 177. Vertical section of the wall of the human stomach, x 15. E., epithelium ; Gl, glands ; 

 Mm., muscularis mucosae. Fig. 178. Goblet-cells of the stomach. Fig. 179. Surface sec- 

 tion of the dog's gastric mucous membrane, showing pits, i, i ; a, the elevations round i, i. 



consist of two zones, an outer clear part, next the lumen of the organ, consisting of a sub- 

 stance (mucigen) which yields mucus, the attached end of the cell being granular.] The oval 

 nucleus lies about the centre of the cells. Spindle-shaped, nucleated cells, probably for re- 



Fig. 180. 



I, Transverse section of a duct of a fundus -gland a, membrana propria ; b, mucus-secreting 

 goblet-cells ; c, adenoid interstitial substance. II. Transverse section of a fundus-gland 

 a, chief, h, parietal-cells ; r, adenoid tissue ; c, capillaries. 



placing the others, are said by Ebstein to occur at their bases. All the cells are open at 

 their free ends, so that the mucus is readily discharged, leaving the cells empty. Numerous 

 tubular glands of two distinct kinds are placed vertically, like rows of test-tubes, in the mucous 

 membrane. 



