THE CELLULE ETHMOIDALES 



49 



c.med 



C.sup. 

 C. supr.l. 

 sph. 



Cap. nas. post. 

 HypopK. 



Os-t.lul5.aud. 



FIG. 15. SAGITTAL SECTION % MM. TO THE RIGHT OF MEDIAN LINE AN- 

 TERIORLY AND 1 Y MM. TO RIGHT OF MEDIAN LINE POSTERIORLY THROUGH 

 THE BODY OF THE SPHENOID. (Fetus one hundred and thirty-five days old. 

 Series B, No. 1. X 1HO 



Shows the lateral nasal wall and the developing sinus sphenoidalis which ex- 

 tends into the remnant of the posterior portion of the cartilaginous nasal 

 capsule. The concha sphenoidalis (ossiculum Bertini) develops in that 

 portion of the cartilage which forms the antero-inferior boundary of the primi- 

 tive sinus sphenoidalis. Cap.nas.post., Capsula nasalis posterior; Hypoph., 

 hypophysis; Ost.tub.aud., ostium tubse auditivse; Vest.na., vestibulum nasi; 

 C.inf., concha inferior; Lob., lobulus; Ag.na., agger nasi; C.med., concha 

 media; C.sup., concha superior; C. supr.l., concha suprema I; S.sph, sinus 

 sphenoidalis. 



