EMBRYOLOGIC CONSIDERATIONS 



21 





' Ca.rt.ca.p-na.. 



ial plug 



-Proc.aa,frotvt 



FIG. 1. DIAGRAM DRAWN FROM A CORONAL SECTION THROUGH ANTERIOR 

 PORTION OF NASAL AREA OF A SIXTY-DAY EMBRYO. (Series A, No. 1, slide 

 2, section 4. X 16%.) 



Cart. cap. na., Cartilage capsulae nasalis, showing the portion which later 

 forms the anterior extremity of the nasal bone; Epithelial plug, a mass of epi- 

 thelial cells complete^ filling the anterior naris; Proc.na. front., antero-inferior 

 portion of the processus nasofrontalis; Lab. sup., labium supeiius. 



C.a.rt.ca.p.na.. 



C.in.1 



FIG. 2. DIAGRAM DRAWN FROM A CORONAL SECTION, 0.82 MM. POSTERIOR TO 



THAT SHOWN IN FIG. 1. (Series A, No. 1, slide 4, section 12. X 16%.) 

 Cart.cap.na., Cartilago capsulse nasalis; Sept.na., septum nasi; C.inf., concha 



inferior. 



