NASOFRONTAL REGION IN MAN 



143 



tiis nasofrontalis are at times in the same axis (figs. 6 and 12). 

 Again the ductus nasofrontalis with its proximal ostium is not in 

 line with the infundibulum ethmoidale. Witness, for example, 

 figure 10: Here the proximal ostium frontale is located medial 

 to the cephalic extremity of the processus uncinatus. Drainage 

 in such cases would in a large measure be diverted directly into 



_ Cellula eth.anf. {med) 



CfilO/la efh.post. 



Rpc c isus spftcnu— eth. 



. M Opticus 



„ A.rafotis inter/ia 

 , S///US spheff.aidaUs 



(onciia //as. sufire/r/al 



Fig. 13 From an adult. Note the roomy ductus nasofrontalis, discontinuous 

 with the infundibulum ethmoidale. The intimate relation between the sinus 

 sphenoidalis and the A. carotis interna is also indicated in the dissection. The 

 section is to the right of the mid-sagittal plane, hence the absence of the 

 hypophysis cerebri. 



the meatus nasi medius. In figure 7 the relation is not one of 

 alignment. In figure 9, passing from the proximal ostia fron- 

 talia, on the lateral wall of the recessus frontalis towards the 

 infundibulum ethmoidale, is a shallow, gutter-like channel. 

 Drainage from the sinus frontales here would largely find its way 

 into the cephalic end of the infundibulum ethmoidale. 



In the specimen shown in figure 8 in which the infundibulum 

 ethmoidale and the ductus nasofrontahs are in direct continuity, 



