r 



Bones of the Skull. 

 Margo sagittalis 



Sulcus sagittalis 



Angulus frontalis 



[ 



T-, . Foveola granularis 



Facies cerebrahs |p acc hionij 



19 



Angulus occipitalis 



Groove for the 

 sinus sphenoparietalis 



Sulcus arteriosus 



Sulcus trans versua 



Angulus sphenoidalis 



-Margo squaraosus 



Angulus mastoideus 



2O. Right parietal bone, os parietale, from within. 



The fades parietalis (see Figs. 19, 55, 56 and 61) is more or less markedly bulged 

 out in the middle; this projection is called the tuber parietale. Below it runs the line a 

 temporalis inferior, convex above, which begins at the margo frontalis as a continuation of 

 the linea temporalis oss. frontalis and goes over at the angulus mastoideus into the linea 

 temporalis oss. temporalis; it itself and the field beneath give origin to the m. temporalis. 

 Concentric with it runs generally a less marked linea temporalis superior, which ends at the 

 margo occipitalis; to it is attached the fascia temporalis. Close to the margo sagittalis there 

 is often, in the posterior third, an opening, the foramen parietale (for the r. meningeus a 

 occipitalis, emissarium parietale). 



On the facies cerebralis (see also Figs. 62 66) along the margo sagittalis runs a 

 groove, completed by apposition with the parietal bone of the other side, the sulcus sagittalis 

 (for the sinus sagittalis sup.; falx cerebri). into which the foramen parietale usually opens. 

 Over the inner surface of the angulus mastoid. runs a short broad flat groove, the sulcus 

 transversus (0. T. groove for lateral sinus) (for the sinus transvers.). At the angulus sphenoid, 

 is found a deep sulcus arteriosus which undergoes tree-like branching upward, close in front 

 of the angulus mastoideus is a second less branched ; both form sometimes, for a short distance, 

 an actual canal, for branches of the a. mening. med. In addition the facies cerebralis presents 

 impressiones digitatae and jug a cerebralia and also frequently, especially in older people, 

 near the sulcus sagittalis, foveolae nranulares [Pacchioni] (0. T. Pacchionian depressions). 

 Corresponding to the tuber parietale there is, on the inner surface, a depression, fossa 

 parictalis, in the region of which the bone is thinned. 



