12 



Bones of the Cranium. 



12. Left Parietal Bone, Os parietale, from the outside. 



On the outer surface of the parietal bone about its center, 

 the parietal eminence, Tuber parietale, projects; the surface is divided 

 into 2 halves by the temporal ridge, Linca semicircular is. 



The 4 1) orders are : the superior, Margo sayittaUs ; the 

 inferior, J/cm/o temporalis (squamosus) ; the anterior, Maryo coronal is, 

 and the p o s t e r i o r , j\faryo lambdoideu*. 



The 4 angles are: the anterior superior, Anyulus frontcdis ; 

 the anterior i n f e r i o r, Anyulus spJ/cnoidalis ; the posterior superior, 

 Anyulus lambdoidcus (occipitalis) , and the posterior inferior,' Anyulus 

 mastoideus. 



At the posterior fourth of the Maryo sayittaUs is the Foramen parietale, 

 for an Emissarium Santorini (t\us is often wanting). 



