I — Occipital border; 2 — Occipital angle;
3 — Parietal tuber; Parietal eminence;
4 — Parietal foramen; 5 — External surface; 6 — Sagittal border; 7 — Frontal angle; 8 — Superior temporal line; 9 — Inferior temporal line; 10 — Frontal border;
II — Sphenoidal angle; 12 — Squamosal border; 13 — Mastoid angle; 14 — Granular foveolae; 15 — Groove for superior sagittal sinus; 16 — Internal surface; 17 — Grooves for arteries; 18 — Groove for sigmoid
sinus