82 



TOPOGRAPHICAL ANATOMY OF THE 



papilke (papilhe foliatse) are two in number. One occurs on each side 

 immediately in front of the point of attachment of the glosso-palatine 

 arch to the tongue. The term " papilla " is scarcely applicable, for each 

 structure consists of an oval area, about 2 cm. or more in length, 

 crossed transversely by a number of ridge-like elevations. 



The mucous membrane of the tongue is continuous with that lining 

 the interior of the mouth in general. Over the dorsum it is thick, 

 dense and papillated, and firmly adherent to the underlying fibrous and 

 muscular tissue. The mucous membrane of the posterior part of the 

 dorsum is plentifully supplied with lymphoid tissue, forming a lingual 



N. hypoglossus. ^ 

 N. lingualis. ^ 



Sublingual vessels. _. 

 M. digastricus. -■ 



A. profunda linguae. 



M. genioglossus. 



M. styloglossus. 



Submaxillary duct. 



— Sublingual gland. 

 M. geniohyoideus. 



M. mylohyoideus. 



Skin. 

 Fig. 27. — Transverse section of the tongue. 



tonsil ^ (tonsilla lingualis), and tonsillar crypts are abundant and obvious. 

 Beneath the tip and over the lateral surfaces the membrane is much 

 thinner, softer, and not so adherent to the subjacent tissues. At the 

 junction of the tip and the body, a median sagittal fold, the frcenulum- 

 linguce, passes, from the tongue to the floor of the mouth. Posteriorly 

 the thick glosso-epiglottic fold (plica glossoepiglottica) connects the 

 tongue and epiglottis. On each side of the fold is a depression, known 

 as the epiglottic vallecula,^ continuous with the depressed area in which 

 the palatine tonsil is lodged. The thick glosso-palatine arch, a fold of 

 mucous membrane connecting the tongue with the soft palate, has 

 already been noted. 



^ Tonsilla [L.], (origin doubtful). 



2 Frenulum (dim. oi franum) [L.], a check-rein. 



2 Vallecula (dim. of vallis) [L.], a valley, a depression. 



