THE SINUS MAXILLARIS 



91 



S.f rcmt. - 



In.i\j rvd . e t K. 

 Fos so-c.ls.cr 



Os1r me-x 



MVJCO us 



cysts / 



s i 



FIG. 33. SPECIMEN FROM A CHILD EIGHT YEARS, Two MONTHS, AND TEN 



DAYS OLD. (Series D, No. 59.) 



Lateral view of frontal, ethmoidal, and maxillary areas. Note that the 

 sinus front alis developed from a cell having its origin from the suprabullar 

 furrow. The right sinus frontalis had a similar origin, these two being the 

 only such instances found in the entire series. The supero-inferior extent of 

 the cellulae ethmoidales is in this case greater than usually found at this age. 

 B.eth., Cellulse bullae ethmoidales; Cel.eth.post., cellulse ethmoidales posterior; 

 Fos.pterygopal., fossa pterygopalatina; Ost.max.acces., ostium maxillare acces- 

 sorium; Ost.max., ostium maxillare; Fos.sac.lacr., fossa sacci lacrimalis; Infund. 

 eth., infundibulum ethmoidale; S.front., sinus frontalis. 



