THE INTERIOR OF THE SKULL 



115 



Fig. 140. — The Skull in Horizontal Section. 



Frontal bone • 



Ridge for falx cerebri 

 Crista galli 



Anterior fossa 

 Cribriform plate 



Lesser wing of sphenoid 



The limbus 



Optic groove. 



Pituitary fossa- 



Dorsum sellae. 

 Petro-sphenoidal process 



Middle fossa- 



The clivus' 



Foramen magnum' 



Posterior fossa 



Internal occipital crest 



Internal occipital protuberance 



Occipital bone 



