THE PHARYNX 



1131 



geal isthmus with the nasal pharynx and below with the laryngeal pharynx. Its 

 posterior wall presents no special features. The anterior wall is deficient above, 

 where there is a communication with the mouth cavity through the isthmus 



Fig. 889. — Vertical Section of a Human Palatine Tonsil, a, Stratified epithelium; 

 b, basement membrane; c, tunica propria; d, trabeculse; e, diffuse lymphoid tissue;/, nodules; 

 h, capsule; i, mucous glands; k, striated muscle; I, blood vessel; q, pits. (From Radasch.) 



J 











i% 







^l^^l^V.^ c 



^1 





faucium. The faucial isthmus is bounded above by the uvula, laterally by the 

 anterior (glosso-palatine) arches, and below by the dorsum of the tongue in the 

 region of the sulcus terminalis. Below the faucial isthmus, the anterior wall of 



Fig. 890. — Portion of a Coronal Section through the Pharyngeal Region, Showing 

 Waldeyer's Tonsillar Ring. (Palatine tonsils hypertrophied. ) 



Temporal lobe 



External pterygoid - 

 Tensor veli palatini - 



Levator veli palatini ■>_ 

 Internal ^f[ 

 maxillary art. *"i^ 

 Neck^of mandible -- ^ 



Internal pterygoid - 



Superior constrictor 



and capsule of tonsil 



Styloglossus 

 Stylohyoid 



Lymph node 

 Hypoglossal nerve 



Lingual artery 



Hyoid bone 



Epiglottis 



Cavity of larynx 









Sphenoidal sinus 



Pharyngeal tonsil 



Aperture of 

 Eustachian tube 



Superior constrictor 

 Soft palate 



"^i^ilS— Uvula 



Palatine tonsil 

 (hypertrophied) 

 '^gj'—^ Angle of mandible 

 ^^J External maxillary 



y^ — artery 

 ^ '^"Lingual tonsil 

 " M. hyoglossus 



. Vallecula 



. Platysma 



the oral pharynx is formed by the root of the tongue, which has been described 

 previously. The lateral wall of the oral pharynx on each side presents the pala- 

 tine tonsil, enclosed in a somewhat triangular tonsillar fossa [sinus tonsillaris] 



