118 



BO^ES OF THE SKULL. 



Fig. 81 is the in- 

 ternal surface of the 

 samebone, shewing the 

 broad and shallow de- 

 pressions (17 and 18) 

 produced by the con- 

 volutions of the ante- 

 rior lobes of the cere- 

 brum and the internal 

 crest (19 and 20), which 

 gives attachment to the 

 dura mater. 



Fig. 82 represents 

 the external surface of 

 the parietals (ossa pa- 

 rietalia) . At its upper 

 (6), anterior (5), and 

 posterior borders (7), 

 are seen the serrated 

 5 edges of the suture, and 

 at its lower border (8), 

 the bevelled edge, 

 which is overlapped by 

 the temporal bone. 



Fig. 83 is the inter- 

 nal surface of the same 

 bone, and at the lower 

 anterior angle is shewn 

 the canal (12) for lodg- 

 ing the middle artery 

 of the dura mater, 

 which is here seen to 

 groove the bone with 

 its numerous branches 



On the internal sur- 

 face of the parietal 

 bones (fig, 84) we ob- 

 serve the longitudinal 

 groove, sulcus longi- 

 tudinalis (1, 1, 1), .for 

 the longitudinal sinus 



