THE SKULL THE CEANIUM 



265 



(Fig. 183), which if prolonged behind would strike the tip of the 

 posterior horn of the crescent. The temporal region is almost vertical, 

 and faces outward and slightly forward. Its anterior arcuate border 

 is thick and jagged and articulates with the lower posterior part of the 

 vertical plate of the frontal bone. The upper border, more or less 

 straight, joins the parietal, and is known as the parietal angle of the 

 bone ; the posterior emarginate border is overlapped by the squamous 

 of the temporal. The temporal region is slightly rougher than the 

 rest of the surface, and forms part of the side of the temporal fossa, 



The orbital region has as its outer boundary the roughened line 

 already mentioned, and as its anterior boundary the remaining part 

 of the oblique anterior border of the alisphenoid. The inner boundary 



FIG. 192. 



With Frontal. 



With Parietal. 

 -Ascending Process. 



With Orbitosphenoid. 

 Sphenoidal Fissure. 

 External Pterygoid Process. 

 With Palatine. 



Hamuhv Process of Internal 

 Pterygoid Process. 



- With Squamosal of Temporal. + 



Foramen Rotundum. 

 Foramen Ovale. 



Root of Tentorium. 



With Parietal and Temporal. 



With Basisphenoid. 



External ^Middle Pterygoid Fossa. 

 Pterygoid 

 Fossa. 



LEFT ALISPHENOID, OUTER ASPECT. 



is the outer upper margin of the sphenoidal fissure. The posterior, 

 artificial limit is the continuation outward of the ridge-like root of 

 the partition dividing the sphenoidal fissure from the foramen rotun- 

 dum. The surface of this region is smooth and flat and faces forward 

 and downward ; it forms the small posterior bony wall of the orbit. 

 The inner part of the orbital portion slopes inward, upward, and back- 

 ward, so as to form an outer wall to the sphenoidal fissure. 



The zygomatic region lies directly behind the orbital region, and 

 is triangular, the sides being nearly equal. The anterior boundary 

 is the posterior boundary of the orbital region ; the external boundary 

 is the middle portion of the emarginate, thick, cleft, and jagged ex- 

 ternal border of the alisphenoid, articulating with the squamous of 

 the temporal opposite the inner end of the glenoid cavity. The inner 



