Editing Parietal bone (section)

== Angles ==
* The '''frontal angle''' is practically a right angle, and corresponds with the point of meeting of the sagittal and coronal sutures; this point is named the [[bregma]]; in the fetal skull and for about a year and a half after birth this region is membranous, and is called the [[anterior fontanelle]].
* The '''sphenoidal angle''', thin and acute, is received into the interval between the frontal bone and the great wing of the sphenoid. Its inner surface is marked by a deep groove, sometimes a canal, for the anterior divisions of the [[middle meningeal artery]].
* The '''occipital angle''' is rounded and corresponds with the point of meeting of the sagittal and lambdoidal sutures—a point which is termed the lambda; in the fetus this part of the skull is membranous, and is called the [[posterior fontanelle]].
* The '''mastoid angle''' is truncated; it articulates with the occipital bone and with the mastoid portion of the temporal, and presents on its inner surface a broad, shallow groove which lodges part of the transverse sinus. The point of meeting of this angle with the occipital and the mastoid part of the temporal is named the [[Asterion (anatomy)|asterion]].