THE CELLULE ETHMOIDALES 



65 



S.froivt. 



Cel. t at u rx d -411 

 ciUront::\Wf-Ost.frorxt. 



Irxf vmd.et K.-J^HltiHfc^ c - 



L.TTxca. 



Sept.rxa.. 

 S.rrxax. 



C.uvf. 



FIG. 23. SPECIMEN FROM A CHILD Two YEARS, Six MONTHS, AND SEVEN 



DAYS OLD. (Series D, No. 24.) 



Posterior view of a coronal section 11 mm. posterior to nasion. Note that 

 the ostia of the frontal sinuses are medial to the uncinate processes, thus do 

 not communicate with the infundibulum ethmoidale. S.front., Sinus frontalis; 

 Ost.front., ostium frontale; Proc.unc., processus uncinatus; C.med., concha 

 media; SepLna., septum nasi; S.max., sinus maxillaris; N.infraorb., nervus 

 infraorbitalis; C.inf., concha inferior; Infund.eth., infundibulum ethmoidale; 

 Cel.front., cellula frontalis; Cr.gal., cristagalli. 



