IOO 



APPLIED ANATOMY. 



The middle meatus is between the middle and inferior turbinated bones. 

 The mucous membrane covering the middle turbinated bone lies closer to it than 

 does that of the inferior turbinated bone, so that it is comparatively rare that treat- 

 ment is necessary to reduce it. 



Polypi usually have their origin in this meatus. Beneath the middle turbinated 

 bone on the outer wall of the nose and only to be seen after removal of the bone, 



Anterior ethmoidal 



Triangular cartilage 



Septal branch of 

 superior coronary 



Posterior ethmoidal 



Branch from the descending palatine 

 FIG. 119. Arteries supplying the septum of the nose. 



there is, just anterior to its middle, a rounded eminence, the bulla ethmoidalis. In it 

 is an opening for the middle ethmoidal cells. Immediately in front is a slit, the 

 hiatus semihmaris, into which open the maxillary sinus (antrum of Highmore) and 

 the anterior ethmoidal cells. The hiatus is continued above as the infundibulum, 

 which enters the frontal sinus. The relation between the hiatus and the opening into 



Anterior nasal hypertrophy 



9 \ 



" f ' \ 



Posterior nasal hypertrophy 

 FIG. 120. View of anterior and posterior hypertrophies of the inferior turbinate. 



the maxillary sinus is such, in some cases, that it is possible for pus originating in 

 the frontal sinus to discharge into the maxillary sinus. A knowledge of the relation 

 of these parts is essential to those desirous of treating nasal diseases. 



The superior meatus is comparatively small and lies above the middle tur- 

 1 biiia^ed DpneU" /At the anteripr^edge of the superior turbinated bone is the opening 

 for the* pxJsterfoV ( etthmfM(fai ( b!eHs x ' Sometimes there are two or three superior turbinals. 



