124 



in the median line, from before backward, the commencement of the groove for 

 the superior sagittal sinus and the frontal crest for the attachment of the falx cerebri; 



Groove for superior sagittal sinus. 



Grooves for anterior meningeal artery. 



Foramen caecum. 



Crista galli. 



Slit for nasal nerve. 



Groove for nasal nerve. 



Anterior ethmoidal foramen. 



Orifices for olfactory nerves. 



Posterior ethmoidal foramen. 



Ethmoidal spine. 



Olfactory grooves. 



Optic foramen. 



Optic groove. 



Olivary process. 



Anterior clinoid process.. 



Middle clinoid process. 



Posterior clinoid process. 



Groove for 6th nerve. 



Foramen lacerum medium. 



Orifice of carotid canal. 



Depression for Gasserian ganglion. 



Meatus auditorius internus. 



Flocculus fossa. 



Superior petrosal groove. 



Foramen lacerum posterius. 



Anterim- condyloid foramen. 



Aquseductus vestibuli. 



Posterior condyloid foramen. 



Mastoid foramen. 

 Posterior meningeal grooves. 



FIG. 94. Base of the skull. Inner or cerebral surface. 



the foramen cecum, an aperture formed between the frontal bone and the crista 

 galli of the ethmoid, which, if pervious, transmits a small vein from the nose to 

 the superior longitudinal sinus; behind the foramen cecum, the crista galli, the 



