SMALL INTESTINE 



289 



Peyer's patches (agminated follicles, agminated glands) are 

 formed by accumulations of lymphatic nodules, usually occurring 

 in that portion of the intestinal mucosa which is farthest removed 

 from the attachment of the mesentery. They frequently form 

 oval areas of macroscopic size. The number of their constituent 



237. THE CENTRAL PORTION OF A PETER'S PATCH 



INTESTINE. 



IN THE ILEUM OF A DOG'S 



a, villi ; 6, crypts ; c, lymphoid nodules, an agminated follicle ; d, connective tissue of the 

 submucosa; , a portion of the muscular coat. Hematein and eosin. Photo, x 35. 



nodules is variable, frequently they contain as many as fifteen or 

 twenty. Each of these nodules is usually invested by a thin fibrous 

 capsule, though frequently they are confluent with one another. 

 20 



