FIG. 5. 

 Trephining of the Facial Sinuses. 



Oblique lateral view of the face with the sinuses exposed. SM, superior maxillary sinus; IM', 

 median portion of inferior maxillary sinus; NC, nerve conduit of su^jerior maxillary division of 

 trifacial nerve; IM, lateral portion of inferior maxillary sinus; F, frontal sinus; FE, fenestrum of 

 communication between thefrontat and superior maxillary sinuses; SI', artificial opening through 

 the superior turbinated bone at the lowestpartof the frontal sinus establishingafree communication 

 with the nasal passage; IT, artificial opening through the inferior turbinated bone at the bottom 

 of the median portion of the inferior maxillary sinus, affording drainage into the nasal passage. 



