THE CELLULE ETHMOIDALES 



The cellulse ethmoidales are often considered as forming 

 anterior, middle, and posterior groups of cells. However, 

 we believe a classification more satisfactory from an anatomic 

 viewpoint, and more practical from the clinical aspect to be 

 one which divides them primarily into anterior and pos- 

 terior groups, each of which is further subdivided. 



All ethmoidal cells having their ostia inferior to the 

 attachment of the concha nasalis media belong to the an- 

 terior group, while those having their ostia superior to the 

 concha media belong to the posterior group (Fig. 43) . This 

 classification holds good regardless of how far the more dis- 

 tant portions of any irregularly developed cell of either group 

 may invade the region ordinarily occupied by cells of the 

 other group. In considering the cells entering into the 

 formation of these two primary groups the following classi- 

 fication will be used: 



f Cellulse frontales. 

 Cellulse ethmoidales anterior: 1 Cellulse infundibulares. 



Cellulse bullse ethmoidales. 





Cellulse ethmoidales posterior : 



Cells communicating with 

 the meatus superior. 



Cells communicating with 

 the meatus supremus I. 



Cells communicating with 

 the meatus supremus II. 



44 



