Bones of the Face. 21 



i.ni'raorb 



Tuga, ct 



23. Right Superior Maxillary Bone, Maxilla superior, 



from the outside. 



The superior maxillary bone is divided into the body 

 and 4 processes, the nasal process, Processus nasalis scu frontalis, the 

 malar or zygomatic process, Processus zyyomaticus, the palatine process, 

 Processus palatinus, and the alveolar process, Processus alveolaris. 



The body has 3 surfaces: the external or facial surface, 

 Superficies facialis, the superior or orbital surface, Superficies orbi- 

 talis, and the internal or nasal surface, Superficies nasalls. The 

 external surface is divided into an anterior or facial and a posterior 

 or zygomatic portion; the anterior concave has at its upper border the 

 infraorbital foramen, and below this the canine fossa, Fovea canina ; the 

 posterior convex is limited posteriorly by the maxillary tuberosity, 

 Tuberositas maxillaris, on which are foramina, Foramina maxillaria super iora, 

 leading to vessel- and nerve canals (posterior dental canals). The orbital 

 surface forms with its anterior border a part of the Margo infraorbital is ; 

 the posterior border forms with the inferior border of the orbital surface 

 of the great wing of the sphenoid the Fissura orbitalis inferior (spheno- 

 maxillary fissure) ; from this a furrow, which changes in its course to a 

 canal, the infraorbital canal, leads to the infraorbital foramen. 



