144 



NORMAL HISTOLOGY. 



rounded by a shallow groove bounded externally by a low annular wall. 

 Their chief interest is their being the principal seats of the taste-buds 

 (page 385), which are lodged within the epithelium lining the mesial wall 



Filiform papilla. 



Surface epithelium 

 covering fungiform 

 papilla 



Projections of tunica 

 propria constituting 

 basis of papilla 



Connective tissue 

 stroma of mucous 

 membrane 





_Muscular tissue of 

 tongue 



FIG. 183. Section of lingual mucous membrane, showing fungiform papilla. X 75- 



of the groove. Into the bottom of this groove open the ducts of the serous 

 lingual glands. At the edges of the tongue, on each side just in front of the 



Epithelium 



,Taste-bud 



Annular wall 



^ 





Muscle fibres 



FIG. 184. Section across circumvallate papilla from child's tongue, showing central part and encircling 



wall. X 45- 



anterior palatine pillar, may be seen a series of small transverse parallel 

 ridges, the papilks foliatce. This structure, varyingly pronounced in man 

 but well developed in the rodents, is of interest on account of the many taste- 

 buds which it often contains. 



