1144 



THE DIGESTIVE SYSTEM. 



Occasionally the osteum pharyngeum is of an oval or slit-like form, with sloping edges, 

 but the triangular shape described above is much more commonly found. 



Immediately posterior to each osteum pharyngeum is seen the recessus pharyngeus 

 (O.T. lateral recess of the pharynx or fossa of Rosenmiiller), a nearly vertical 

 depression of considerable depth (Figs. 903 and 905), which extends laterally in the 

 form of a flattened pouch or diverticulum. 



Middle concha 

 Middle meatus of nose 



Inferior meatus 

 of nose 



Superior meatus of nose 



Sphenoidal sinus 

 Inferior concha 



Posterior edge of nasal septum 

 rifice of auditory tube 



Bursa pharyngea 

 Part of the 



Genioglossus 



Recessus 

 pharyngeus 



Torus levatorius 



Salpingo- 

 pharyngeal fold 



Glands in soft 



palate 



Glosso-palatine 



arch 



Supra tonsillar 



fossa 



Plica triangularis 

 Palatine tonsil 



Pharyngo- 

 palatine arch 



Epiglottis 



Ary-epiglottic 

 ild 



Cricoid cartilage 



Genio-hyoid 



Lymph follicle 



Hyoid bone 



FIG. 903. SAGITTAL SECTION THROUGH MOUTH, TONGUE, LARYNX, PHARYNX, AND NASAL CAVITY. 



The section is slightly oblique, and the posterior edge of the nasal septum has been preserved. Th( 

 specimen is viewed slightly from below, hence, in part, the low position of the inferior concha. 



The pharyngeal recesses project laterally over the superior margin of the superior constrict 

 below the petrous portion of the temporal bone, and correspond in position to the sinus o 

 Morgagni on each side (cf. description of pharyngeal wall, p. 1149). The recess has been considerec 

 to be the remains of the inner or pharyngeal portion of the second visceral cleft, the lowe; 

 part of which is represented in the supra -tonsillar fossa, but more probably it is not connectec 

 with any of the visceral clefts, but makes its appearance after they have disappeared. 



Pars Oralis. The oral part of the pharynx lies behind the mouth, between th< 

 soft palate above and the superior aperture of the larynx below. On its anterio 

 aspect is the isthmus of the fauces, leading into the mouth. Below this tin 

 vertical pharyngeal portion of the tongue forms the anterior wall. Its side wal 



