28 



Bones of the Face. 



Proc.urbitaT.is 



Spina nasalis 

 posterior 



Pars liorizontalis 



32. Left Palate Bone, 33. Left Palate Bone, 



Os palatmum, from tlie inside. Os palatinum, from behind. 



The palate bone consists of 2 portions or plates placed at 

 right angles to each other, the perpendicular plate, Pars perpendicularis, 

 and the horizontal plate, Pars liorizontalis. 



The perpendicular plate shows on its inner surface 2 horizontal 

 crests: the lower, the inferior turbinated crest, Crista turlinalis, for 

 articulation with the inferior turbinated bone; the upper, the superior 

 turbinated crest, Crista ethmoidalis, for the Concha ethmoidalts inferior (middle 

 turbinated bone). The posterior border shows the Sulcus pterygo-pala- 

 tinus, which forms with the similar sulcus on the pterygoid process of 

 the sphenoid bone and the groove at the posterior angle of the body of 

 the superior maxilla the pterygo-palatine canal, Canal is pterygo-palatinus. 

 The superior border has two processes, separated by an intervening 

 notch, the Tncisvra spheno-palatlna : the anterior process is the orbital pro- 

 cess, Proccxxus orbital i* (often containing some Cellulae palatinae) ; the posterior 

 sphenoidal process, I'roccwus xplienoirtalis, when articulated with the sphenoid 

 bone, forms the groove on the inferior surface of the body of the sphenoid 

 into a canal, the Canal is splitno-palatinus. 



The horizontal plate forms the back part of the hard palate, the 

 inner border (articulated with the horizontal plate of the other palate 

 bone) the Crista. nasalis, which is extended posteriorly into the posterior 

 nasal spine, tfpina nasalis posterior. At the place where the perpendicular 

 and horizontal plates blend, is the pterygoid or pyramidal process, Processus 

 pyramidal is, which is inserted into the pterygoid notch of the sphenoid 

 bone. The pterygo-palatine canal, formed together with the sphenoid and 

 superior maxillary bones, divides inferiorly into 3 canals, which open into 

 the 3 posterior palatine foramina in the hard palate. 



The palate bone articulates with 6 bones: 2 of the cranium, the 

 sphenoid and ethmoid, and 4 of the face, the superior maxillary, the inferior 

 turbinated, vomer and opposite palate bones. 



