THE SKELETON 



47 



of the brain (Fig. 104). The posterior boundary of this fossa 

 is the clinoid plate, and its lateral projections are the posterior 

 clinoid processes. On each side of the basisphenoid there ex- 

 tends dorsally in a narrow strip to the parietal the alisphenoid, 





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at the base of which, craniad of the tympanic bulla, are three 

 foramina in a line. The most cranial and largest one is the 

 sphenoidal sinus or anterior lacerated foramen, which transmits 

 the third, fourth, and sixth cranial nerves supplying the eyeball 



