280 HEAD AND NECK 



lingualis, can be distinguished. Further, if the tongue is 

 pulled upwards, a median fold of mucous membrane will be 

 seen to connect its under surface to the floor. It is the frenulum 

 lingua. At the sides of the frenulum the dissector must 

 look for the openings of the submaxillary ducts. Each 

 terminates on a papilla placed close to the side of the 

 frenulum. More posteriorly, between the side of the tongue 

 and the mandible and on the summit of the plica sub- 

 lingualis, are the openings of the sublingual ducts. 



Roof of the Mouth. The hard and the soft palates form 



Frenulum linguae. 



Tip of tongue 



turned up' , _. ^ ., _ 



Deep lingual vein nVtaST^T A L '^&M31 \ 



"Plica sublingu.ilis 



Orifice of 

 submaxillary duct 



FIG. 105. The Sublingual Region in the Interior of the Mouth. 



the continuous concave and vaulted roof of the mouth (Fig. 

 1 06). Projecting from the middle of the posterior free margin 

 of the soft palate, and resting upon the dorsum of the tongue, 

 the uvula will be seen (Fig. 106). Running along the median 

 line of both the hard and the soft palates is a raphe 

 which terminates anteriorly, opposite the incisive foramen 

 of the hard palate, in a slight elevation or papilla termed 

 the incisive papilla. In the anterior part of the hard palate 

 the mucous membrane, on each side of the raphe, is thrown 

 into three or 'four transverse hard corrugations or ridges; 

 more posteriorly it is comparatively smooth. By carefully 

 palpating the postero-lateral angles of the palate the dissector 



