THE SINUS FRONTALIS 



141 



S.f rorvt. I 



Ost.irortt 

 Cel.f rorxt 



H.semi. 

 Proc.urxc 



C. i n.1 



C.naed.tcut 

 C.sup. 



supr.I. 

 Os-t.spK. 



FIG. 51. SPECIMEN NINETEEN YEARS, SEVEN MONTHS, AND FIFTEEN DAYS 



OLD. (Series D, No. 88.) 



Median sagittal section. The anterior portion of the concha media and a 

 portion of the frontal bone have been removed to show the anterolateral nasal 

 wall. The hiatus semilunaris is in this instance unusually short. B.eth., 

 Bulla ethmoidalis; C.med., concha media (cut surface); C.sup., concha su- 

 perior; C. supr.I, concha suprema I; Ost.sph., ostium sphenoidale; S.sph., 

 sinus sphenoidalis; C.inf., concha inferior; Proc.unc., processus uncinatus; 

 H.semi. , hiatus semilunaris; Cel.front., cellulae frontales; Ost.front., ostium 

 frontale; S. front., sinus frontalis. 



