... . cribriform 



ethmoidal spine plate 



frontal 



crest joramen caecum 



jugum ethmoidale 

 optic groove 



optic foramen 



anterior clinoid 

 process 



foramen rotundum 



sulcus arteriosus 

 foramen ovale -f 



foramen spinosum . 



trigeminal impression 



internal auditory meatus 

 jugular foramen 



(anterior compartment) 



lambdoid suture 



ista galli 



fronto-ethmoidal suture 

 ' sulci arteriosi 

 ,-' olivary eminence 



, - ' sphenofrontal suture 



dorsum sellae 

 coronal suture 

 carotid groove 



'sphenoparietal suture 

 ' sphenosquamosal suture 



'foramen lacerum 



petro-occipital fissure 

 —hiatus Fallopii 



-jugular foramen 



fieirous~-*Vi ' 

 ^ortiojtj.if^-f' sigmoid groove 



condyloid canal 

 mastoid foramen 



^--transverse groove 



jugular tubercle 



remains of the spheno-occipital suture internal internal hypoglossal canal 

 synchondrosis «%** %gg 



ranee 



Fig. 43. 



Figs. 43 and 44. The inner surface of the base of the skull ( 4 /bV 



In fig. 43 the various bones are colored as in fig. 38. 



