THE ALIMENTARY CANAL 



of their constituent nodules is variable, frequently they contain as m.-mv 

 as fifteen or twenty. Each of these nodules is usually invested by a thin 

 fibrous capsule, though frequently they arc roiiiliiciit with our ;im>t her. 



d~ 



c B,il ' 





. j 



FIG. 342. THE CENTRAL PORTION OF A PEYER'S PATCH IN THE ILEUM OF A DOG'S 



INTESTINE. 



a, villi; b, glands; c, lymph nodules, an agminated follicle; d, connective tissue of 

 the submucosa; e, a portion of the muscular coat. Hematein and eosin. Photo. 

 X 35. 



The long axes of the ovoid nodules exceed the averse thickness of 

 the mucous membrane so that the patch forms a superficial elevation of 

 the mucosa and its deeper surface penetrates the mnsriihins mucosae 

 and enters the submucous coat. Hence occasional fragments of the nuis- 

 cularis mucosffi often occur between the bases of the constituent nodules. 



