THE CELLULES ETHMOIDALES 



71 



v Cel.irotvt. 



Cel.h.e-tK. 



P r o o . \J n. <x 



FIG. 26. SPECIMEN FROM A CHILD FOUR YEARS, SEVEN MONTHS, AND NINE- 

 TEEN DAYS OLD. (Series D, No. 40.) 



Anterior view of coronal section, cut 16 mm. posterior to the nasion, show- 

 ing the lateral and supero-inferior extent of the maxillary sinuses, their rela- 

 tions to developing teeth, and the relations of the ostium maxillare to the 

 infundibulum ethmoidale. Note ridge beneath the right nervus infraorbit- 

 alis. The bullar cells have their ostia in the suprabullar furrow. The ostia 

 of the cellulae frontales are medial to the processus uncinatus and the bulla 

 ethmoidalis. Cel.front., Cellulse frontales; Cel.b.eth., cellulse bullse ethmoid- 

 ales; Infund.eth., infundibulum ethmoidale; Ost.max.; ostium maxillare; 

 N.infraorb., nervus infraorbitalis; S.max., sinus maxillaris; Proc.unc., pro- 

 cessus uncinatus. 



