THE CELLULE ETHMOIDALES 



67 



I Hi 



S.f r>or\t 



C e 1-i.n.t un.d. 

 Irtlurxcl.e-th.. 



S.ITX &~ 



|Cel.b.etK. 



,Cel. ctK.po3t. 



For. etK.poet 



For. opt t. c. 

 i A -c a-r. xrvt. 



S.ca.v. 



FIG. 24. SPECIMEN FROM A CHILD Two YEARS, Six MONTHS, AND TWELVE 



DAYS OLD. (Series D, No. 25.) 



Lateral view of left frontal, ethmoidal, and maxillary sinus areas. Note 

 advance of sinus frontalis into the vertical portion of the frontal bone. Cel. 

 b.eth., Cellulae bullae ethmoidales; Cel.eth.post., cellula ethmoidalis posterior; 

 For.eth.post., foramen ethmoidale posterius; For.optic., foramen opticum; 

 A.car.int., arteria carotis interna; S.cav., sinus cavernosus; S.sphenopar., 

 sinus sphenoparietalis; For.rotundum., foramen rotundum; S.max., sinus 

 maxillaris; Infund.eth., infundibulum ethmoidale; Cel.infund., cellulse in- 

 fundibulares; S. front., sinus frontalis. 



