THE CELLULE ETHMOID ALES 



61 



C . s u p. 



C. Supr.l. 

 C.Supr. H. 

 C.-Sph.. 

 S.spK- 



Lob. 



C.irxi. 



t.-tub-aud. 



FIG. 22. SPECIMEN FROM A CHILD ONE YEAR, TEN MONTHS, AND THIRTEEN 



DAYS OLD. SAGITTAL SECTION SHOWING LATERAL WALL OF THE NASAL 



CAVITY AND THE SINUS SPHENOIDALIS. (Series D, No. 20.) 



Note the overlapping of the concha superior by the anterior portion of the 



concha suprema I ; also note the accessory furrow on the medial surface of the 



concha media. In a plane more lateral than that shown in the illustration, 



the sinus sphenoidalis is more extensively developed in the posterolateral 



direction, its inferolateral wall being only 1 mm. from the fossa pterygopalatina 



and 2 mm. from the foramen rotundum. C.med., Concha media; C.sup., 



concha superior; C.supr. I, concha suprema I; C.supr. II, concha suprema II; 



C.sph., concha sphenoidalis (ossiculum Bertini); S.sph., sinus sphenoidalis; 



Hypoph., hypophysis; Ton.phar., tonsilla pharyngea; Ost.tub.aud., ostium 



pharyngeum tuba? auditivse; C.inf., concha inferior; Lob., lobulus. 



