ELEMENTAR Y ~ ANA TOMY. 



[LESS. 



the foramen lacerum posterius and condyloid foramen, and, in 

 the middle, the foramen magnum and basi-occipital. 



FIG. 90. A VIEW OF THE UPPER, OR CEREBRAL, SURFACE OF LEFT SIDE OF 

 MAN'S SKULL. 



a, greater wing of the sphenoid ; bo, base of the occipital ; c, .cribriform plate ; 

 f, orbital plate of fruntal ; g, crista galli ; o, lesser or orbital wing of the sphe- 

 noid ; p, pituitary fossa ; pa, parietal ; so, squama of occipital : sq, squarnous 

 part of temporal bone ; 3, foramen lacerum anterius ; 4, foramen ovale ; 6, 

 foramen lacerum posterius ; 7, meatus auditorius internus in the petrous part 

 of the temporal boae. 



The removed cap of the skull is smooth within, showing 

 sundry slight depressions, and amongst them a longitudinal 

 median groove, to which is attached the membrane called the 

 jalx, which extends back from the crista galli and dips in 

 between the two upper halves of the brain. 



