EMBRYOLOGIC CONSIDERATIONS 



39 



FIG. 11. DIAGRAM DRAWN FROM A CORONAL SECTION JUST DORSAL TO THE 

 RECESSUS SPHENO-ETHMOIDALIS OF A ONE-HUNDRED-DAY EMBRYO, SHOWING 

 THE DEVELOPMENT OF THE SINUS SPHENOIDALES INTO THE POSTERIOR POR- 

 TION OF THE CARTILAGINOUS NASAL CAPSULE. (Series A, No. 8, slide 18, 

 section 6. X 10.) 

 Cart.cap.na., Cartilage capsulse nasalis, posterior portion; Ost.sph., ostium 



sphenoidale; Sept.na., septum nasi, most posterior portion; Pal.moL, palatum 



molle. 



