THE SKULL THE CRANIUM 



middle is joined to the vertical plate of the palatine, and all behind 

 that point articulates with the pterygoid process of the posterior 

 sphenoid. The posterior end of the vomer embraces the anterior end 

 of the median ridge on each side (Fig. 137). The anterior angles of 

 the surface are produced in front ; the anterior margin on each side 

 is directed from the angle obliquely inward and backward to the 

 median ridge, and articulates with the posterior edge of the expanded 

 part of the vomer. From the anterior angles each lateral margin is 

 evenly and decidedly emarginate back to the region of the optic fora- 

 men, where it turns inward and backward and articulates with the 

 crest on the anterior surface of the pterygoid process, which forms the 

 inner edge of the Vidian groove within the groove for the sphenoidal 

 fissure. The posterior margin is very short and slightly emarginate. 

 The anterior surface of the presphenoid (Fig. 185) is almost 



FIG. 185. 



Temporal Surface of Right 

 Alispheiwid. 



Sphenoidal Fissure. 



Foramen Rotundum. 



Foramen Ovale. 



Sphenoidal Angle. 

 E.fti nial Pterygoid Pr<> <<->'. 



Left Alisphenoid. 



Superior Surface of Presphenoid. 



Ridge for Lower Ethmoidal 

 Scroll. 



Ethmoidal Crest. 



~-Line on Lateral Surface of Orbito- 

 sphenoid. 



Vidian Groove. 

 Orbital Surface of Pterygoid Process. 



Internal Pterygoid Process. 



Hnmular Process. 

 THE SPHENOID BONE. VIEWED FROM THE FRONT AND THE RIGHT SIDE. 



entirely occupied by two large openings into the hollow interior of 

 the bone. There is in fact nothing left but the thin margins articu- 

 lating with the cribriform plate of the ethmoid and -the vomer, and 

 the median vertical partition, or ethmoidal crest, articulating with the 

 posterior edge of the mesethmoid. The side margins of these openings 

 are further forward than the upper and lower margins, owing to the 

 greater length of the lateral surfaces, and, inasmuch as these surfaces 

 are concave externally, they are convex internally and flare outward 

 in front, each facing inward and forward and permitting much of the 

 anterior part of the outer wall of each sinus to be seen from in front. 



