Bones of the Cranium. 



13 



13. Left Parietal Bone, Os parietale, from the inner side. 



The i 1111 e r concave surface shows Impressiones diyitatae, and J?^a 

 cerebralia, and along the upper border Pacchionian depressions ; further 

 2 tree-like, ramifying grooves, Sulti meiiingei, (for the middle meningeal 

 artery and the accompanying veins); finally 2 venous sulci. Of the latter 

 the one along the upper border forms with the one on the bone of the 

 other side, a channel for the superior longitudinal sinus, Sinus longitudinal is 

 superior; the second, at the posterior inferior angle of the bone is for 

 the transverse sinus. 



In the posterior superior angle of the figure a W o r m i a n bone, 

 Ossiculum suturarum, Wormianum, is represented. 



The parietal bone articulates with 5 bones, with the parietal bone of 

 the other side, the occipital bone, the frontal bone, the temporal bone and the 

 sphenoid bone. 



