183 



THE SKELETON. 



sphenoid behind : quite posteriorly are seen the sphenoidal turbinated bones, 

 the orifices of the sphenoidal sinuses and the articulation of the alas of the 

 vomer with the under surface of the body of the sphenoid. 



Fig. 133. Roof, Floor, and Outer Wall of Nasal Fossa. 



Pfobf panted thrmejh 

 Nato -lachrymal Canal 



Natal 

 Natal Sfinc of Frontal Bwe 



htlatl 



Sujjerior Mcatu* 

 -Middle. Mcatus 

 - Inferior 



Floor 



Ant. Nasal tfjniif 



falatt froc.of Suf.AIax:. 



Palate Proc. offataU 



Post. Natal tfpiiu 



Ant. FaloM.m Canal 



The floor is flattened from before backwards, concave from side to side, an 

 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 sutu 

 between the palate and superior maxillary bones, and the posterior nasal spin 



The inner wall, or se/^wra(Fig.l34), is a thin vertical partition, which separates 

 the nasal fossa3 from one another; it is occasionally perforated, so that the fosi 

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

 formed, in front, by the crest of the nasal bones and nasal spine of the fron 

 in the middle, by the perpendicular lamella of the ethmoid; behind, by t 

 vomer and rostrum of the sphenoid; below, by the crest of the superior m:ixi 

 lary and palate bones. It presents, in front, a large triangular notch, wine 

 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 i 

 in;irked by numerous vascular and nervous canals and the groove for the nas 

 palatine nerve, and is traversed by sutures connecting the bones of which it 

 formed. 



The outer wall (Fig. 133) 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, and the internal pterygoid process of 

 the sphenoid. This surface presents three irregular longitudinal passages, or 





