2o8 



HUMAN ANATOiMY. 



THE INFERIOR TURBINATE BONE. 

 This is an elongated curved bone^ placed in the lateral wall of the nasal cavity 

 below the superior and middle turbinates, which are parts of the ethmoid. The inner 



convex surface is pitted and grooved by the 

 cavernous tissue beneath the mucous membrane. 

 This condition is continued round the free lower 

 border a little way up the outer side. The rest 



Lachrymal 

 process 



Ethmoidal process 



Right inferior turbinate bone in place, inner aspect. 



Fig 



Lachrymal 

 process 



of the outer surface, overhanging the inferior nasal meatus, is nearly smooth. The 



ends of the bone are pointed. They are connected below by the regular curve of 



the inferior border. The upper border is 

 thin and irregular. It articulates in front 

 with the inferior turbinate crest of the max- 

 illa. Behind this rises the lachrymal process ^ 

 — the highest — to meet the lachrymal bone. 

 Posterior to this the maxillary process ^ bends 

 outward and downward. It does not, how- 

 ever, usually hook over the upper edge of 

 the plate bounding the entrance of the an- 

 trum, but meets it edge to edge, consider- 

 ably reducing the opening. Still farther 



back is the ethmoidal process^ meeting the uncinate process ; and, finally, the border 



rests on the inferior turbinate ridge of the palate bone. 



Articulations. — The inferior turbinate articulates with the superior maxillary, 



ethmoid, palate, and lachrymal bones. j 



Development. — Ossification proceeds from a single center which appears 



about the middle of foetal life. 



Ethmoidal 

 process 



Maxillary 

 process 



Right inferior turbinate bone, outer aspect. 



> Concha inferior. " Proc. lacrlmalis. ^ Proc. niaxiilaris. * Proc. ethraoidalis. 



