THE SINUS FRONTALIS 



147 



i 



Fis. supra.. 

 C.me.cl. 

 C.sup. 



Hvjpo 



-S. irorvt. 



fc-H.SerrLi. 



Proc. 



int.. 



utxc. 



FIG. 53. SPECIMEN TWENTY-ONE YEARS, Six MONTHS, AND TWENTY-NINE 



DAYS OLD. (Series D, No. 91.) 



Sagittal section. 1.5 mm. to the left of median line. Anterior portion of 

 concha media has been removed to show the relations of structures forming the 

 lateral nasal wall. 1, Probe through ostium frontale; 2, probe through ostium 

 sphenoidale; S.front., sinus frontalis; H.semi., hiatus semilunaris; Proc.unc., 

 processusuncinatus; C.inf., concha inferior; Ost.tub.aud., ostium pharyngeum 

 tubas auditivse; Hypoph., hypophysis; C.sup., concha superior; C.med., 

 concha media; Fis.supra., fissura suprabullaris; B.eth., bulla ethmoidalis. 



