THE SINUS MAXILLARIS 



107 



Cel.i ro ut 



S.iront. 

 Sept. -treat. 



el. front. 



Probe in. 



II uct.aa. \aicr. 



. \a-cr. 



FIG. 41. SPECIMEN FROM A CHILD TWELVE YEARS, NINE MONTHS, AND 



TWELVE DAYS OLD. (Series D, No, 69.) 



Anterior view of a coronal section cut 12 mm. posterior to the nasion, to 

 show superior and lateral extent of the sinus frontales, also the relations of the 

 cellulae frontales. The frontal sinuses and all cells shown in this illustration 

 have their ostia medial to the uncinate processes. Note the relations of the 

 ductus nasolacrimalis. S.front., Sinus frontalis; Sept.front., septum frontale; 

 Cel.front., cellulae frontales; Fos.sac.lacr., fossa sacci lacrimalis; For.infraorb., 

 foramen infraorbitalis; Duct.na.lacr., ductus nasolacrimalis. 



