NC 



FIG- 4. 

 Trephining of Facial Sinuses. 



Right side of face, viewed laterally, showing extent and relations of the sinuses. O, orbita 

 cavity; SM, superior maxillary sinus; IM", median portion of inferior maxillary sinus; NC, 

 nerve conduit of superior maxillary trunk of the trifacial: IM. laierial portion of inferior 

 maxillary sinus; F, frontal sinus; ST, opening through superior turbinated bone for the 

 establishment of drainage from the frontal and superior maxillary sinuses into the nasal pas- 

 ■ sage; IT, opening through inferior turbinated bone for the establlshmeiit of drainage from 

 the median portion of the inferior maxillary sinus into the nasal cavity. 



