Parietal boneOnline version external and internal surfaces by Michon Perre 1 articulates with opposite parietal bone 2 Articulates with occipital bone 3 Articulates with temporal bone 4 Articulates with frontal bone 5 Frontal angle 6 Sphenoid angle 7 Mastoid angle 8 Grooves for middle meningeal vessels 9 Occipital angle