THAI'. Ill 



THE SENSE OF TASTE 



L27 



I. The organs of taste are principally located in tho depth of 

 the strati tied epithelium of certain parts of the dorsuiu and sides 

 nf the tongue the organ which comes into immediate contact 

 with the food, owing to the part it plays in the mastication of 



solids and deglutition of fluids. 



FKI. 51. 



. 51. Papillary surface ol bhe IMM^HC, witli ili' j ta uc. > ami tm i >iis. (Sapijry.) ], Circumvallate 

 papilla^ ; -j, foramen caecum ; H, rangiform papillae ; -i, Nlit'onn Mini conical papillae; .^trans- 



verse ami oblique snlci ; (i, mUCOUS xlanils ami lymphatic t'cillicli-s at l>asr ,,{ touiiin- aihl on 



- ; 7. tonsils; B, ti]. ufcpi-luttis ; '.i, naninin epiglottidis. 



The anterior two-thirds of the tongue (Fig. 51) are covered on 

 the dorsal surface, tip, and edges with a mucous membrane 

 richly supplied with papillae visible to the unaided eye. The 

 circumvallate papillae, 7-12 in number, can be distinguished at 

 the border between the two anterior thirds and the posterior 

 third of the tongue, and fonn the lingual V : the fungiform 



