Fra. 28. A semidiagrammatic drawing of the lateral nasal wall showing positive 
fronto-maxillary relations. Note that the infundibulum ethmoidale is directly 
continuous with the naso-frontal duct. Note also the superior and lateral curv- 
ing of the processus uncinatus at its dorsal termination, thus forming a pocket at 
the dorsal end of the infundibulum ethmoidale. This pocket is so situated that 
it will direct fluid coming to the dorsal end of the infundibulum ethmoidale to 
the ostium maxillare and into the sinus maxillaris. 
The concha nasalis media is in part cut away so as to expose the underlying 
structures. 
Fic. 29. Asemidiagrammatic drawing of the lateral nasal wall with the concha 
nasalis media partially removed. Note that the infundibulum ethmoidale termi- 
nates blindly at its superior and ventral end. The nasofrontal duct communi- 
cates directly with the meatus nasi medius and not with the infundibulum eth- 
moidale as in the preceding figure (28). This represents negative fronto-maxillary 
relations. 
Fic. 30. A semidiagrammatic 
drawing of the lateral nasal wall 
showing that the sinus frontalis, 
in this ease, has two nasofrontal 
ducts, one communicating with 
the infundibulum ethmoidale and 
the other with the meatus nasi 
medius. 
Note that the infundibulum eth- 
moidale terminates at its dorsal 
extremity in the meatus nasi me- 
dius without a pocket formation 
(compare this condition with figs. 
28, 29). 
C. N.Sup.,C. N.Med., C. N. Inf., = 
conche nasales, superior, media 
and inferior; S. Sph.,=sinus sphen- 
oidalis; S. F., = sinus frontalis; B. 
Eth.,=bulla ethmoidalis; Inf. Eth., 
= infundibulum ethmoidale; Proc. 
Unc., = processus uncinatus. 
