148 



OSTEOLOGY 





Behind the dorsum sellse is a shallow depression, the clivus, which slopes obliquely 

 backward, and is continuous with the groove on the basilar portion of the occipkal 

 bone; it supports the upper part of the pons. 



Middle Clinoid process 

 Posterior Clinoid process 



Ethmoidal 

 spine 



Optic foramen 

 Superior orbital 

 fissure 



Foramen rotundum 



Foramen Vesalii 



Foramen ovale 



Foramen spinosum 



Spina angularig 



With 



palatine 



FIG. 145. Sphenoid bone. Upper surface. 



The lateral surfaces of the body are united with the great wings and the medial 

 pterygoid plates. Above the attachment of each great wing is a broad groove, 

 curved something like the italic letter /; it lodges the internal carotid artery and 

 the cavernous sinus, and is named the carotid groove. Along the posterior part 



Artie, irith perpendicular" 

 Sphenoidal crest P late of ethmoid 



Tensor vel 

 palatini 



Medial pterygoid platf * 

 Ilamulu 



FIG. 146. Sphenoid bone. Anterior and inferior surfaces. 



of the lateral margin of this groove, in the angle between the body and great wing, 

 is a ridge of bone, called the lingula. 



The posterior surface, quadrilateral in form (Fig. 147), is joined, during infancy 

 and adolescence, to the basilar part of the occipital bone by a plate of cartilage. 



