168 



MICROSCOPIC AX ATOM Y OF THE 



eye, and slightly projecting above the surface of the mucosa. 

 In the centre of these masses is a deep depression, known as 



FKJ. 123. 



Epithe- 

 lium 



Tunica 



propria 



Lymph 



nodule 



Obliqu 

 sectio' 

 of ductr 

 of mucous 

 gland 



Muscle 

 fibres 

 cmL 

 trans- 

 versely 



Section through a lingual follicle in man. x, crypt. X 50. 



the crypt. This is a blind canal lined, like the surface of 

 the tongue, with stratified epithelium (Fig. 123). It is dis- 

 tinguished from the epithelium of the tongue, however, by 



FIG. 124. 



Leucocytes 



through epithelium / 



Ejiithelium 



Adenoid 



tissue in 



tunica 



propria 



From a thin section through a lingual follicle of man 



the presence of places where the lymphocytes have pushed 

 their way between the epithelial cells to reach the surface 



