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. 



rlit! iiiUsi~dlari" mucosae oc- 

 cupies the deepest layer of the 



FIG. 201. 







Section of pyloric glands from human stomach : 

 a, motuh 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 (g,g) 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- 







yI^ 



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

 testinal surface ; /, 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. 



j 



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 4s 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- 







