EMBRYOLOGIC CONSIDERATIONS 



27 



FIG. 5. DIAGRAM DRAWN FROM A CORONAL SECTION, 0.97 MM. POSTERIOR TO 

 THAT SHOWN IN FIG. 4. (Series A, No. 1, slide 10, section 6. X 16%.) 

 Cart.cap.na., Cartilage capsulse nasalis; C.sup., concha superior (note 



that at this stage of development there is no cartilage in this concha); 



C.med., concha media; C.inf., concha inferior. 



PtOC. UTXC. 



ItvKmd.eth. 



FIG. 6. DIAGRAM DRAWN FROM CORONAL SECTION THROUGH ANTERIOR 

 THIRD OF NASAL AREA OF A SIXTY-FIVE-DAY EMBRYO, SHOWING THE DE- 

 VELOPMENT OF THE PROCESSUS UNCINATUS, WHICH AT THIS PERIOD AP- 

 PEARS AS A RIDGE ALONG THE SUPERIOR CURVED BORDER OF THE CONCHA 

 INFERIOR. (Series A, No. 3, slide 5, section 11. X 16.) 



C.med., Concha media; Sept.na., septum nasi; C.inf., concha inferior; In- 

 fund.eth., infundibulum ethmoidale; Proc.unc., processus uncinatus. 



