MOUTH 281 



will be able to feel the hamuli of the medial pterygoid 

 laminae. 



Isthmus Faucium. The isthmus of the fauces is the name 

 given to the communication between the mouth proper and 

 the pharynx (Fig. 106). To obtain a good view of it the 

 mouth must be well opened and the tongue depressed. The 

 isthmus faucium and the parts which bound it can be 

 examined best in the living subject, and the dissector should 

 study his own isthmus faucium with the aid of a looking-glass 



Uvula 



Pharyngo- 

 palatine arch 



Palatine tonsil 



Glosso-palatine 

 arch 



Posterior wall of 



oral part of 



pharynx 



Tongue 



FIG. 1 06. Isthmus of the Fauces as seen through the widely opened Mouth, 

 The palatine tonsils, in the subject from which this drawing was made, 

 were somewhat enlarged. 



(Fig. 1 06). It is bounded above by the soft palate, below by 

 the dorsum of the tongue, and on each side by a curved 

 fold of mucous membrane, termed the arcus glossopalatinus 

 (O.T. anterior pillar of the fauces). 



Each glosso-palatine arch descends from the posterior part 

 of the inferior surface of the soft palate and, inclining forwards 

 as it descends, it ends upon the side of the posterior part of 

 the tongue. It encloses the glosso-palatinus muscle. . 



The pharyn go-palatine arches which are also described as 

 boundaries of the isthmus of the fauces lie, in reality, on the 

 side wall of the oral part of the pharynx. They pass down- 



