110 



OSTEOLOGY. 



The^Zoor is flattened from before backwards, concave from side to side, and wider 

 in the middle than at either extremity. It is formed in front by the palate process 

 of the superior maxillary ; behind, by -the palate process of the palate bone. This 

 surface presents, from before backwards, the anterior nasal spine ; behind this, 

 the upper orifice of the anterior palatine canal ; internally, the elevated crest 

 which articulates with the vomer; and behind, the suture between the palate and 

 superior maxillary bones, and the posterior nasal spine. 



Fig. 66. Roof, Floor, and Outer Wall of Nasal Fossae. 



JLrrizontalfla.U 



SpJifJiotd 



floor 



Ant. Nasal 

 Palate jfroc.of Suf- 

 Palate- Proc. cffalatt 

 Post. Nasal Spit* 

 Ant. Palauuiif Canal 



The inner wall or septum (fig. 67) is a thin vertical partition, which separates 

 the nasal fossae from one another ; it is occasionally perforated so that the fossae 

 communicate, and it is frequently deflected considerably to one side. It is formed, 

 in front, by the crest of the nasal bones and nasal spine of the frontal ; in the 

 middle, by the perpendicular lamella of the ethmoid ; behind, by the vomer and 

 rostrum of the sphenoid ; below, by the crest of the superior maxillary and palate 

 bones. It presents, in front, a large triangular notch, which receives the triangular 

 cartilage of the nose ; above, the lower orifices of the olfactory canals ; and behind, 

 the guttural edge of the vomer. Its surface is marked by numerous vascular and 

 nervous canals, and traversed by sutures connecting the bones of which it is 

 formed. 



The outer wall is formed, in front, by the nasal process of the superior maxillary 

 and lachrymal bones ; in the middle, by the ethmoid and inner surface of the 

 superior maxillary and inferior turbinated bones ; behind, by the vertical plate of 

 the palate bone. This surface presents three irregular longitudinal passages or 

 meatuses, formed between three horizontal plates of bone that spring from it; they 

 are termed the superior, middle, and inferior meatuses of the nose. The superior 

 meatus, the smallest of the three, is situated at the upper and back part of each 

 nasal fossa, occupying the posterior third of the outer wall. It is situated between 

 the superior and middle turbinated bones, and has opening into it two foramina, 

 the spheno-palatine at the back part of its outer wall, the posterior ethmoidal cells 



