PHARYNX 



377 



sloping upper surface of the soft palate. Between the posterior 

 border of the soft palate and the posterior wall of the pharynx 

 there is an interval, termed the pharyngeal isthmus, through 

 which the naso-pharynx communicates with the oral pharynx. 



It is important to note that the posterior wall and roof of the naso- 

 pharynx can be explored by the finger introduced through the mouth and 

 the pharyngeal isthmus. 



When the naso-pharynx is illuminated, by light reflected from a mirror 



Tongue 



Hyoid 

 Plica vocalis 



Rima glottid 



Recessus piriformis J 



Superior cornu 

 of thyreoid 



Pharyngeal wall 

 (cut) 



Glosso-epiglottic 

 fold 



Vallecula 



Pharyngo- 

 epiglottic fold 



Epiglottis 



Tubercle of 

 epiglottis 



Ary-epiglottic 



fold 



Laryngeal ventricle 



Plica ventricularis 

 Cuneiform cartilage 



Corniculate 

 cartilage 



Posterior aspect 

 of cricoid cartilage 



FIG. 150. 



-Superior Aperture of Larynx exposed by cutting through 

 the posterior wall of the pharynx. 



introduced through the mouth, a view of the four orifices which open into 

 this part of the pharynx may be obtained. Owing to the mirror being 

 placed obliquely, and below the level of the hard palate, only the posterior 

 parts of the inferior conchoe are visible through the choanse, and the inferior 

 meatuses of the nose are altogether out of sight. The middle and superior 

 meatuses of the nose and the middle and superior concha, however, can 

 be brought into view and their condition ascertained. The lateral walls 

 of the naso-pharynx and the orifices of the auditory tubes can also be fully 

 inspected. 



Pars Oralis. The oral pharynx lies posterior to the mouth 

 and tongue. The pharyngeal part of the tongue, which looks 



