THE BONES OF THE HEAD ill 



is serrated for the posterior border of the palatal process of the 

 superior maxilla. The posterior border is concave and sharp. It 

 gives attachment to one-half of the soft palate, and at its inner 

 extremity it forms a backward projection, which, with its fellow, 

 constitutes the palatal or posterior nasal spine, for the attachment 

 of the azygos uvulae muscle. The external border is attached, 

 and meets the perpendicular plate at a right angle. On its outer 

 aspect posteriorly it is excavated by the lower part of the posterior 

 palatine canal. The internal border is thick and serrated, and 

 articulates with its fellow, forming an upward elevation, called the 

 nasal crest. This crest is continuous with that of the palatal 

 processes of the superior maxillse, and, like it, is grooved superiorly 

 for a portion of the inferior border of the vomer. 



The perpendicular plate rises upwards from the outer border 

 of the horizontal plate. It is long and thin, and presents two 



Internal or Ethmoidal Surf. ^ ^^^^ Sup. or Orbit. Surf, of Orbital Process 



Anterior or Maxillary Surt-^ -^jWt Posterior or Sphenoidal Surface 



SjAeno-palatine Notch ^_ ifs^jjwl ^V^Sphenoiaal Process 



Superior Turbinate or j||||B^^^%^^^ 



Ethmoidal Crest /•yj^^llJfc^^i^'''- Superior Meatus 



J. ^ Middle Meatus 



/ '^^y^-fi-'i^^f^ Inferior Turbinate Crest 



Maxillary Process . jL -^^i i 



\ . ^^Wl~ Inferior Meatus 



X. , ' _,^v?t\ ^^^k , ^°'' P'^ygoid Fossa of Sphenoid 



\^,/l' l^^Js'^^\.'- ^"^ ^•'"' P^'^O'goid Plate 



J^''M~j.^y^^^^fel^py of Sphenoid 



Nasal Crest { | Tuberosity 



Posterior Nasal Spine For InL Pterygoid Plate of Sphenoid 

 Fig. 68. — The Right Palate Bone (Internal View). 



surfaces and four borders. The internal zurface forms part of the 

 outer wall of the nasal fossa, and is crossed from before backwards 

 by two ridges. The lower ridge is called the inferior turbinate crest, 

 and articulates with the posterior sloping part of the superior 

 border of the inferior turbinate bone. The upper ridge, which 

 crosses the roots of the orbital and sphenoidal processes, is called 

 the ethmoidal or superior turbinate crest, and it articulates with the 

 inferior turbinate process of the ethmoid. Below the inferior 

 turbinate crest is a smooth groove, which forms part of the inferior 

 meatus of the nose ; between the inferior and superior turbinate 

 crests is another groove, which forms part of the middle meatus ; 

 and above the superior turbinate crest there is a third groove, 

 which forms part of the superior meatus. The external or maxillary 

 surface, towards its upper and posterior part, forms the inner 

 boundary of the pterygo-maxillary fissure, and leading dowTiwards 

 from this part is a groove, which, with Lhe superior maxilla, forms 



