THE FACE, MOUTH AND PHARYNX 



pass medially, stripping up the muco-periosteum, and form an 

 abscess on the palate (Fig. 54). Alveolar abscess in connection 

 with the teeth of the mandible has been described on p. 145. 



The Tongue is subdivided into a pharyngeal and an oral 

 portion by the sulcus terminalis, a V-shaped groove situated at 



Maxilla _ 

 Tooth abscess -- 

 Muco-periosteum of palate 

 Tone ue - 



Periosteum 

 Tooth abscess 



Maxillary sinus 

 Inferior meatus 



Alveolar abscess 

 Maxilla 



Mucous mem- 

 brane of cheek 



Submaxilkry duct 



'Lingual nerve 

 Genio-glossus 

 Sublingual gland 



Genio-hyoid 



Skin 



Digastric, ant. belly j 7 



Lymph gland / 



Deep cervical fascia 



Abcess 



Mylo-hyoid 

 Hyoid bone 



FIG. 54. Frontal Section through the Mouth. Four varieties of alveolar 

 abscess are shown. In the maxilla, on the right side, the pus has spread 

 laterally, forming an abscess under the mucous membrane ; on the left 

 side, it has spread medially, forming a palatal abscess. In the mandible, 

 on the right side, the pus has perforated the bone medial to the attach- 

 ment of the deep cervical fascia, forming an abscess which is covered by 

 the fascia and the skin ; on the left side, the pus has perforated the bone 

 outside the deep fascia, forming an abscess immediately under the skin. 



the junction of its middle and posterior thirds. The apex of 

 the V lies posteriorly and coincides with the foramen caecum 

 (p. 169). Numerous collections of lymphoid tissue are present 

 in the pharyngeal portion of the tongue (Lingual tonsils}. They 

 form small rounded elevations, and each possesses a crypt into 

 which mucous glands open. 



The mucous membrane on the upper surface of the anterior 

 two-thirds of the tongue is roughened by the projection of 

 numerous papillae, but on the under surface it is smooth, and 



