THE SKULL AND THE BONES OF THE SKULL 



95 



Frontal sinuses 



Sinns frontales 



Middle turbinate bone 



Concha nasalis media \ 



Crista galli 

 Crista galli 



Anterior cranial fossa '^jfB'nfNjr^f 

 \WJP* 



Orifice of the canal ' &'%&c.<r-*-*>'#~^gA 



of the nasal duct --f^g^M 



hiBK&Bi 



,. Frontal sinus 

 Sinus frontalis 



Maxillary sinus, or antrum 

 of Highmore 



Sinus maxillaris 



. Orifice of the frontal sinus 

 Apertura sinus frontalis 



Lachrymal bone 



Os lacrimale 



Vertical plate of the ethmoid bonu 



Lamina perpendicularis 



Canal of the nasal duct 

 Canalis nasolacrimalis 



Lachrymoturbinal suture 



Sutura lacrimoconchalis 



'"^Inferior turbinate bone 

 Concha nasalis inferior 



FIG. 210. By MEANS OF A SECTION PASSING VERTICALLY THROUGH THE POSTERIOR PORTIONS 

 OF BOTH LACHRYMAL BONES, THE ANTERIOR PORTION OF THE NASAL CAVITY AND OF THE 

 ORBITS is DISPLAYED IN FRONTAL SECTION. SEEN FROM BEHIND. 



From the right side of the anterior portion of the skull -thus divided, a layer of bone a quarter of an inch 

 in thickness has been removed by a section in a plane parallel with the first section, so as to open 

 up the canal of the nasal duct, canalis nasolacrimalis, in its entire length. The sounds passed into 

 the two frontal sinuses indicate the orifices of these sinuses in the nasal fossx. A third sound 

 has been passed through the left canal of the nasal duct from the orbit into the nasal cavity. 



Cavum nasi et orbita Nasal cavity and orbits. 



