92 OSSA PALATI. 



Each of the ossa malarum is joined, by its superior and. 

 internal orbitar processes, to the os frontis, and the orbitar 

 process of the sphenoid bone; by the edge between the internal 

 and inferior orbitar processes, to the maxillary bone ; by the 

 side between the maxillary and inferior orbitar process, again 

 to the maxillary bone ; and by the zygomatic process to the os 

 temporis. 



Ossa Palati. 



The ossa yalati form the back part of the roof of the mouth, 

 and extends from it along the external sides of the posterior 

 openings of the nose, into the orbits of the eyes. Each bone 

 may therefore be divided into four parts, the 'palate square hone, 

 or palatine, or horizontal process, the pterygoid process or 

 tuberosity, the nasal lamella or perpendicular plate, and the 

 orbitar process. 



The square bone is irregularly concave, for enlarging both 

 the mouth and cavity of .the nose. The upper part of its 

 internal edge rises in a spine, after the same manner as the 

 palate plate of the maxillary bone does, to be joined with the 

 vomer. Its anterior edge is unequally ragged, for its firmer 

 connexion with the palate process of the os maxillare. The 

 internal edge is thicker than the rest, and of an equal surface, 

 for its conjunction with its fellow of the other side. Behind, 

 this bone is somewhat in form of a crescent, and thick, for the 

 firm connexion of the velum pendulum palati ; the internal 

 point being extended backwards, to afford origin to the palato- 

 staphylinus or azygos muscle. This square bone is well dis- 

 linf^uished from the pterygoid process by a perpendicular fossa, 

 which, applied to a similar one in the maxillary bone, forms a 

 passage (^pterygo-maxillary) for the palatine branch of the fifth 

 pair of nerves ; and by another small hole behind this, through 

 which a twig of the same nerve passes. 



The iHerygoid process is somewhat triangular, having a 

 broad base, and ending smaller above. The back part of this 

 process has three fosss formed in it ; the two lateral receive 

 the ends of the two pterygoid plates of the sphenoid bone ; the 





