TONSILS 



221 



first described by Stohr (Biol. Centrabl., 1882, vol. 2). It occurs also in 

 the epithelium of the lingual tonsil as seen in Fig. 211. In the reticular 



Epithelium. 



V, 



Tunica propria. 



Lymph nodule. .-- 



Fibrous sheath. .. ^-^ 



Germinal center. Epithelium and pit containing lymphocytes. 



FIG. 210. VERTICAL SECTION THROUGH A PIT IN THE LINGUAL TONSIL OF AN ADULT MAN. X 26. 



Emigrating lymphocytes. 



Fragments of epithelium. 



Emigrated 

 lymphocytes. 



Stratified / 

 epithelium \ 



Lymphoid tissue 



of the tunica 



propria. 



FIG. 211. FROM A THIN SECTION OF A LINGUAL TONSIL OF AN ADULT MAN. X 420. 

 On the left the epithelium is free from lymphocytes, on the right many lymphocytes, are wandering through. 



tissue of the tunica propria, especially around the pits, there are many 

 lymph nodules, some of which are well defined, with germinative centers, 



