Bones of the Skull. 



23 



Labyrinthus ethmoidalis (medial surface) 



/ Processus lacrimalis conchae~nasalis inferioris 

 Processus uncinatus ossis ethmoidalis 



Processus ethmoidalis conchae nasalis inferioris 



Processus ethmoidalis 



Processus lacrimalis 



Fig. 27. 



Processus maxillaris 



26 and 27. Right inferior turbinated bone, 



concha nasalis inferior. 



Fig. 26 above, from within. Fig. 27 below, from without. 



The concha nasal is inferior (inferior turbinated bone) (see also Figs. 68, 73 and 74) 

 is paired ; it lies on each side in the lower part of the lateral wall of the nasal cavity and is 

 placed sagittally in its longest diameter. It is oblong, very porous, bent so as to be convex 

 median ward, and hangs downward as a free mass from its upper attached margin. The inferior 

 border is much thickened and lateralward somewhat rolled. The upper thinner margin is 

 attached in front to the crista conchalis maxillae and gives off close behind this point the 

 processus lacrimalis, directed obliquely upward and forward, which unites with the inferior 

 margin of the os lacrimale (suiura lacrimoconchalis) and helps the sulcus lacrimalis maxillae 

 (see p. 28) to complete the canalis nasolacrimalis. Somewhat further backward the broad 

 processus maxillaris projects lateralward and downward, so as to lie on the inferior circum- 

 ference of the hiatus maxillaris; above this broad process arises the narrower, more irregular 

 processus ethmoidalis which passes upward to unite with the processus uncinatus oss. ethmoi- 

 dalis. The most posterior part of the upper margin is attached to the crista conchalis 

 088. palatini. 



