696 



Jacob Parsons Schaeffer. 



ous with a frontal furrow; if not continuous, the intervening la- 

 mella of tissue may have been resorbed and the two channels thus 

 made continuous. It is not common for the injundihulum eth- 

 moidale to be directly continuous with the nasofrontal duct. At first 

 sight it may appear so, but careful dissection will show that, in the 

 majority of cases where intimate relations exist between the in- 



Ductus naso frontalis 

 Infun dihulum eth mo idale 

 Bulla ethmoldalis 



Sinus frontalis 



Processvs 

 uncinatus 



Ostium maxillare 

 accessorium 



Fig. 48 A semidiagrammatic drawing of an adult lateral nasal wall. The con- 

 cha media is again represented as partly cut away so as to expose the operculated 

 structures. Compare the nasofrontal relations with those represented in figs. 

 46 and 47. Practically all of the secretion from the frontal sinus would drain 

 directly into the meatus nasi medius. The frontal sinus is doubtless an exten- 

 sion of an anterior ethmoidal cell. 



fundibulum ethmoidale and the nasofrontal duct, the two chan- 

 nels meet each other at varying angles. At times there is actually a 

 slight groove connecting the two channels. We have, however, 

 no right to say that in such cases, the nasofrontal duct is directly 

 continuous with the ventral and superior end of the infundibulum 

 ethmoidale. 



