THE TONGUE 



88i 



Each papilla presents a narrow attached base and a broad free end and is 

 seated in a circular cup which is surrounded bv a rim or vallum. ' 



Upon the bases of most of these papilla? a central depression marks the orifice 

 ot one or more glands. Secondary i^apillae lie hidden under the thick epithelial 

 covering both of the chief papilla and the circular rim which surrounds it. 



The fungiform papillae are more thinly covered with epithelium, and are redder 

 in colour than the smaller papillae amongst which thev are scattered. They occur ir- 

 regularly over the dorsum, sides, and tip of the tongue^ and are most numerous in the 

 two latter situations ; each papilla is attached by a comparatively narrow base and 

 has a broader, rounded, and free extremity, studded with smaller secondary papilla? 



EXTREMITY OF CORNU OF False voeal cord 



HYOIO BONE 



SUPERIOR CORNU OF THYROID 

 CARTILAGE 



LATERAL GLOSSO- 

 EPIGLOTTIDEAN FOLD 



Fig. 507. — Dorsum of the Toxgue. 



lower end of pharynx 



ANTERIOR WALL OF THE 

 PHARYNX 



CORNICULUM LARYNGIS 



- CUNEIFORM CARTILAGE 



SINUS PYRIFORMIS 



True voeal cord 





MEDIAN GLOSSO- 

 EPIGLOTTIDEAN FOLD 



J vf ^ff' 



POSTERIOR PILLAR OF FAECES 



A:<TERI0R pillar of FAUCES 



CIRCUMVALLAtE PAPILL/E 



ADENOID TISSUE AT BACK OF 

 TONGUE 



FORAMEN C/tCUM 



FUNGIFORM PAPILL/€ 



The filiform or conical papillae, named from their general shape, thickly beset 

 the whole of the dorsum, sides, and tip of the tongue in front of the circumVallate 

 group. They faintly ridge the organ with delicate lines, Avhich posteriorly lie 

 parallel with the circumvallate papillae, but become more and more transverse in 

 direction as they approach the tip and sides of the tongue. They present secondary 

 papilke upon their surfaces thickly overlaid with epithelium. 



The lingual glands are especially abundant near the foramen caecum and in 

 the neighborhood of the circumvallate papillae, as well as along the borders of the 

 tongue. 



