THE CELLULE ETHMOIDALES 



75 



S.iron.-t- 



ln.1uad.e-tK 



S. rrvewx 



FIG. 28. SPECIMEN FROM A CHILD FIVE YEARS, TEN MONTHS, AND 

 TWENTY-TWO DAYS OLD. LATERAL VIEW OF FRONTAL, ETHMOID AL, 

 SPHENOIDAL, AND MAXILLARY AREAS TO SHOW THE EXTENT OF PNEU- 



MATIZATION PRESENT AND THE RELATIONS OF THE SlNUSES. (Series D, 



No. 45.) 



Osseous wall, between sinus sphenoidalis and fossa pterygopalatina, is % 

 mm. thick, while from sinus cavity to foramen rotundum is 1 mm. Sinus 

 frontalis developed from an infundibular cell. Cel.eth.ant., Cellulae ethmoidales 

 anterior; Cel.eth.post., cellulse ethmoidales posterior; S.sph., sinus sphenoidalis; 

 For.optic., foramen opticum; A.car.int., arteria carotis interna; N.abduc., 

 nervus abducens; For. rotundum, foramen rotundum; Fos.pterygopaL, fossa 

 pterygopalatina; S.max., sinus maxillaris; Infund.eth., infundibulum eth- 

 moidale; S. front., sinus frontalis. 



