THE DIGESTIVE TRACT. 



tissue, thicker layers of fibrous tissue enveloping the entire group. 

 Numbers of lymph-cells are intermingled with the fibrous tissue 

 of the mucosa ; in the vicinity of the pylorus considerable patches 

 of diffuse adenoid tissue lie around and among the ends of the 



gastric follicles and constitute the 

 FIG. 200. lenticular glands. 



The muscularis mucosae oc- 

 cupies the deepest layer of the 



FIG. 201. 



Section of pyloric glands from human stomach : 

 a, mouth of gland leading into long, wide duct 

 (b), into which open the terminal divisions ; c, 

 connective tissue of the mucosa. 



Section of pyloric region of human stomach, 

 showing irregular mass of adenoid tissue lying 

 between the gastric tubules (f,f) constituting a 

 lenticular gland ; s, submucous tissue. 



tunica propria, and is composed of an inner circular and an outer 

 longitudinal layer of non-striped muscle ; the tissue of the muscu- 



FlG. 2O2. 



I 



Longitudinal section of child's stomach passing through pyloric orifice : S, I, the gastric and the in- 

 testinal surface ; p, pyloric glands, which gradually extend into the submucosa to become Brunner's 

 glands (b) ; a, simple follicles of the intestinal mucosa ; s, submucosa ; t, the greatly thickened layer 

 of circular muscle constituting the pyloric ring ; /, longitudinal muscular tunic. 



laris mucosae extends within the interglandular septa, often as far as 

 the free surface of the mucous membrane, beneath which the muscle- 

 cells disappear. 



The submucosa is a coat of considerable thickness, composed 

 of a felt-work of fibro-elastic bundles of varying size, but so loosely 

 interwoven that the mucosa may be shifted readily within con- 



