THE INTERIOR OF THE SKULL 



191 



the abducent nerve. On either side of the sella turcica is the carotid groove, which 

 is broad, shallow, and curved somewhat like the italic letter /. It begins behind 



Groove for super, sagittal sinus 



Grooves for anter. meningeal vessels 



Foramen caecum 



Crista galli 



Slit for nasociliary nerve 

 Groove for nasociliary nerve 

 Anterior ethmoidal foramen 



Orifices for olfactory nerves 

 Posterior ethmoidal foramen 



Ethmoidal spine 



Olfactory grooves 



Optic foramen 

 Chiasmatic groove 

 Tuberculum sellae 

 Anterior clinoid process 

 Middle clinoid process 



Posterior clinoid process 



Groove for abducent nerve 



Foramen lacerum 



Orifice of carotid canal 



Depression for semilunar ganglion 



Internal acoustic meatus 



Slit for dura mater 



Groove for superior petrosal yhtua 



Jugular foramen 



Hypoglossal canal 



Aquceductus vestibuli 



Condyloid foramen 



JIastoid foramen 

 Posterior meningeal grooves 





FIG. 193. Base of the skull. Upper surface. 



at the foramen lacerum, and ends on the medial side of the anterior clinoid process, 

 where it is sometimes converted into a foramen (carotico-clinoid) by the union of 

 the anterior with the middle clinoid process; posteriorly, it is bounded laterally 



