I H 1 i I I i i 1 



and nasal cavities, and it • 



a number of irregular n 

 from the olfactory bulb, which i 

 continue their course downward u 

 lateral nasal wall. The i 

 anterior ethmoidal vessels and nerve, i 

 two small, somewhat quadrangular, 1 

 toward the base of the frontal 

 posteriorly Figs, is and ; | . I 

 frontal bone and articulates ly with th< 



The perpendicular />/<//, I 

 two lateral masses and forms ti • 

 approximately pentagonal in shape. I: anterioi 

 spine by the frontoethmoidal suture; it 

 cartilaginous nasal septum*; its inferior border articulate 

 vomer, which forms tin remainder of tin- bony septun 

 the sphenoidal i I the body of the sphenoid 1* 



superior border i> received betwe< the ini- 



The ethmoidal labyritu 'i aieral >■ art paired structun 



or less completely subdi\*ided by numerous line bonyplal 

 only partially situated within tin- cthm< and are frequent 



bones, particularly by thi tal. 



W( quently distingui 



ethmoid bon< I imina ; 



lai hryma 



I "in external surface of the labyrinth fon 



and 96 . It i- quadrilateral in f -it of it 



tlu- lamina pap\' . although it i 



cavity it articulates anteriorly with tlu- lachrymal bone, 

 with tin- palate bone I tin- orbital surfa iperiorly w ith tin 



the two ethmoidal foramina si 

 ethmoidal suture I 5 and 1 I lu ma 



closing in tin- ethmoidal < < 11-. 



The internal wall of tin- ethmoidal labyrinth 1 

 oi the outer nasal wall, and from it two thin rough I 



rolled up, project into tin- n. I tin I 



turbinated bone (con* >; 1 h 



turbinated bone artieul. ith tin ethmoidal en .ik 



* In this situation tlu- pi 

 it is rarelv placed exactly in the 



t These sutures have been •• upon pagi - 



