THE SINUS FRONTALIS 



153 



a.eth,. 



C.mecUcut 

 L&.m. crib. 



Sella. turcicd 



P roc.unc. 

 Proc.tront.max 

 Os Ucr. 

 P 



; ClLVUS 



For.sphL.pal. 

 Lam. med. 





'Os pal. 



FIG. 56. SPECIMEN THIRTY-FIVE YEARS OLD. SAGITTAL SECTION FROM WHICH 

 THE SOFT PARTS HAD BEEN REMOVED BY MACERATION. (Series E, No. 5.) 

 Concha nasalis media has been removed to allow a better view of the proc- 

 essus uncinatus and the bulla ethmoidalis. The sinus frontalis developed 

 from an infundibular cell. 1., Probe through ostium frontale; 2., probe 

 through ostium sphenoidale; B.eth., bulla ethmoidalis; C.med., concha media 

 (cut surface); Lam.crib., lamina cribrosa; C.sup., concha superior; C.supr.I, 

 concha suprema I; For.sph.pal., foramen sphenopalatinum; Lam.med., 

 lamina medialis processus pterygoidei; Os pal., pars perpendicularis ossis 

 palatina; C.inf., concha inferior; Proc.eth., processus ethmoidalis conchse 

 nasalis inferior; Os lacr., os lacrimal; Proc. front. max., processus frontalis 

 maxilla?; Proc.unc., processus uncinatus; H.semi., hiatus semilunaris; Ag.na., 

 agger nasi; S. front., sinus frontalis. 



