LYMPH FOLLICLES OF SMALL INTESTINE. 



197 



the neighboring cells just as the border cells of the stomach -glands 

 differ from the central cells. 



The body of the villus is composed of a very delicate kind of 

 connective tissue, forming a slender frame in which a little cage- 

 like network of bloodvessels surrounds a central lacteal radicle. 

 The interstices of this connective tissue are filled with pale proto- 



FIG. 91. 



I 



Diagram of Section of the Mucous Membrane of the Intestine, showing the 

 position of the lymph follicles (a). (Cadiat.) 



plasmic cells, like those formed in the lymph. Under the base- 

 ment membrane forming the foundation of the epithelium are 

 some unstriated muscle cells which embrace the villus and are 

 able to squeeze it and empty the vessel it contains. 



The lacteal radicles which lie in the villi are sometimes double, 

 and have a communication with the lymph spaces of the connec- 

 tive tissue. They frequently branch as they pass down from the 

 villi to reach the dense network of lacteal vessels which lies be- 

 neath the mucous membrane. At irregular intervals throughout 

 the submucous tissue are found masses of lymphoid tissue similar 



