230 



Anatomy of Skeleton 



uttk 

 freaU. 



The inner or nasal surface (Fig. 185) of the body presents the large, irregular 

 opening of the antrum. The surface may be taken on the whole as vertical, but its 

 upper part is sloped outward and here the ethmoid rests on it and covers in the upper part 

 of the opening of the antrum. The posterior third or more has the vertical plate of the 

 palate applied to it, also closing in the antral aperture, and the upper end of the vertical 

 plate passes up between the maxilla and the ethmoid, separating them and appearing 

 between them in the extreme back part of the orbital floor. In front of the antral 

 opening is the groove for the nasal duct, which is covered in from this aspect, in its 

 upper part, by the lachrymal bone ; this bone also encroaches to a slight extent on the 

 upper and front part of the antral orifice. The lower part of the opening is filled by 

 the down-turned maxillary process of the inferior turbinate bone, so that the opening, 

 still further reduced to a very small size by mucous membrane, is situated in the outer 

 wall of the nose above the inferior turbinate, i.e., in the middle meatus. 



Below the level of the inferior turbinal articulation the nasal surface is smooth 



and concave, forming the wall 



middle Mi*. of the inferior meatus and 



becoming continuous with the 

 smooth upper surface of the 

 palatine process. 



In front of the lower end 

 of the lachrymal groove the 

 inner surface of the body is 

 continuous with the inner 

 surface of the nasal process. 

 Here there is a ridge that 

 anterior part of 

 turbinate, which, 

 crosses the lower 

 end of the lachrymal groove 

 and forms its bony wall below 

 the lachrymal bone. 



The nasal process, by its 

 posterior aspect, forms the 

 front wall of the nasal duct and articulates here with the lachrymal. In addition 

 it has : 



suffice 



ethmoid rests. 



ser/jee on 

 "tich orii'bl 

 fibre afpa.i3tt 



postencroa latihe 

 groove . 



tor vtrtial plate of 



for tvl/erosity if- 

 fala.Ce 



in/trier 

 ~ ne 



carries the 

 the inferior 

 to reach it 



palatine protest. 

 FIG. 185. View of inner aspect of right maxilla. 



(a) An inner surface, forming the wall of the nose above the inferior turbinal 

 ridge, smooth and concave and covered by mucous membrane of the atrium of 

 the middle meatus, and ridged above for articulation with the middle turbinate 

 (ethmoid). 



(b) A front border articulating with the nasal bone. 



'c) A rounded outer border, that forms part of the orbital margin and has the 

 tendo oculi attached to it. 



(d) A facial surface, covered by and giving origin to Orbicularis palpebrarum 

 and continuous with the facial surface of the body. 



(e) A rough upper end articulating with the frontal. 



The thick alveolar process contains eight alveoli for permanent teeth, separated by 

 interalveolar septa. The incisors are carried in the (premaxillary) portion below 

 the nasal opening, the canine, bicuspids, and first molars below the facial surface 



