Plate V. 



Trephining of Facial Sinuses. 



Oblique lateral view of the face with the sinuses exposed. 

 SM, superior maxillary sinus ; IM^, median portion of in- 

 ferior maxillary sinus ; NC, nerve conduit of superior maxil- 

 lar}' division of trifacial nerve ; IM, lateral portion of inferior 

 maxillary sinus ; F, frontal sinus ; FE, fenestrum of com- 

 munication between the frontal and superior maxillary 

 sinuses ; ST, artificial opening through the superior turbi- 

 nated bone at the lowest part of the frontal sinus establishing 

 a free 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. 



