THE GENESIS, DEVELOPMENT, AND ADULT ANAT- 

 OMY OF THE NASOFRONTAL REGION IN MAN 



J. PARSONS SCHAEFFER 



Daniel Bough Institute of Aiidtoini/ and Biology of the Jefferson Medical College 

 of Philadelphia 



THIRTEEN FIGURES 



Owing to the contradictory and often but general statements 

 extant in the literature on the nasofrontal connections, the writer 

 deemed it important to make a more detailed study of the em- 

 bryology and adult anatomy of this region. The present com- 

 munication will in a sense supplement previous studies on the 

 embryology of the nose by the WTiter. Special attention is. here 

 given to an analysis of the adult anatomy, and an effort is made 

 at an intelligent interpretation of the complicated region by refer- 

 ring to the genesis and development of the parts involved. The 

 anatomy of the nasofrontal connections is of considerable im- 

 portance clinically, since the sinus frontalis is now frequently 

 approached from the nasal cavity in operative procedures. 

 With the latter thought in mind, important anatomic types of 

 the region commonly encountered are illustrated by drawings 

 from actual personal dissections. The embryology is dealt 

 with but briefly; the reader is referred to previous papers by the 

 author for more detailed discussions. 



EMBRYOLOGY 



The nasofrontal region is genetically an outgrowth from the 

 ventral and cephalic end of the meatus nasi medius, operculated 

 by the concha nasalis media (middle turbinated bone). The 

 mucosa of this part of the meatus nasi medius is, therefore, the 

 proton of what subsequently becomes the recessus frontalis of 

 the meatus nasi medius (early in evidence) and derivatives there- 



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