THE SINUS FRONTALIS 



139 , 



S. fro at. 



Cel.irxtu nd 

 tnf un.cl.Gt K. 



Cel.etfi.post 



(a^ber ran.fi 



Cel.h.atK. 



Cel.etK.post. 

 N. optic. 



N.oculom.. 



N.trocH,. 



FIG. 50. SPECIMEN NINETEEN YEARS AND TWENTY-EIGHT DAYS OLD. 



LATERAL VIEW OF FRONTAL, ETHMOIDAL, AND MAXILLARY AREAS. (Series 



D, No. 86.) 



Note presence of an aberrant ethmoidal cell which has invaded the postero- 

 superior portion of the maxilla. The ostium of this cell is in the midportion 

 of the lateral wall of the meatus superior. When this type of development is 

 more extensive, a "double maxillary sinus" is formed, as described by Zucker- 

 kandl. Cel.b.eth., Cellula? bullse ethmoidales; Cel.eth.post., cellulse ethmoidales 

 posterior; N.optic., nervus opticus; N.abduc., nervus abducens; N.oculom., 

 nervus oculomotorius; N.troch., nervus trochlearis; Gang.semi., ganglion 

 semilunare; S.max., sinus maxillaris; Cel.eth.post. (aberrant), aberrant cellula 

 ethmoidalis posterior; Infund.eth., infundibulum ethmoidale; Cel.infund., 

 cellula infundibularis; S. front., sinus frontalis. 



