Editing Parietal bone (section)

==In other animals==
[[File:Tuatara skull diagram.svg|thumb|Skull of the [[tuatara]] (''Sphenodon punctatus''), with the pineal foramen enclosed by the parietal bones]]
In non-human vertebrates, the parietal bones typically form the rear or central part of the [[skull roof]], lying behind the frontal bones. In many non-mammalian [[tetrapod]]s, they are bordered to the rear by a pair of [[postparietal bone]]s that may be solely in the roof of the skull, or slope downwards to contribute to the back of the skull, depending on the species. In the living [[tuatara]] and some lizards, as well as in many fossil tetrapods, a small opening, the ''parietal foramen'' (also called the ''pineal foramen''), is present between the two parietal bones at the midline of the skull. This opening is the location of the [[parietal eye]] (also called the pineal or third eye), which is much smaller than the two main eyes.<ref name="VB">{{cite book |author=Romer, Alfred Sherwood|author2=Parsons, Thomas S.|year=1977 |title=The Vertebrate Body |publisher=Holt-Saunders International |location= Philadelphia, PA|pages= 217–244|isbn= 0-03-910284-X}}</ref><ref>{{Cite journal |last=Benoit |first=Julien |last2=Abdala |first2=Fernando |last3=Manger |first3=Paul |last4=Rubidge |first4=Bruce |date=2016 |title=The sixth sense in mammalians forerunners: variability of the parietal foramen and the evolution of the pineal eye in South African Permo-Triassic eutheriodont therapsids |url=http://www.app.pan.pl/article/item/app002192015.html |journal=Acta Palaeontologica Polonica |doi=10.4202/app.00219.2015|doi-access=free }}</ref><ref>{{Cite journal |last=Smith |first=Krister T. |last2=Bhullar |first2=Bhart-Anjan S. |last3=Köhler |first3=Gunther |last4=Habersetzer |first4=Jörg |date=April 2018 |title=The Only Known Jawed Vertebrate with Four Eyes and the Bauplan of the Pineal Complex |url=https://linkinghub.elsevier.com/retrieve/pii/S0960982218302069 |journal=Current Biology |language=en |volume=28 |issue=7 |pages=1101–1107.e2 |doi=10.1016/j.cub.2018.02.021|doi-access=free |url-access=subscription }}</ref>

===In dinosaurs===
The parietal bone is usually present in the posterior end of the skull and is near the midline.  This bone is part of the skull roof, which is a set of bones that cover the brain, eyes and nostrils. The parietal bones make contact with several other bones in the skull.  The anterior part of the bone articulates with the [[frontal bone#In dinosaurs|frontal]] bone and the [[postorbital bone]].  The posterior part of the bone articulates with the [[squamosal bone]], and less commonly the [[Occipital bone#In other animals|supraoccipital]] bone.  The bone-supported neck frills of ceratopsians were formed by extensions of the parietal bone.  These frills, which overhang the neck and extend past the rest of the skull is a diagnostic trait of ceratopsians.  The recognizable skull domes present in pachycephalosaurs were formed by the fusion of the frontal and parietal bones and the addition of thick deposits of bone to that unit.<ref>Martin, A.J. (2006). Introduction to the Study of Dinosaurs. Second Edition. Oxford, Blackwell Publishing. pg. 299-300. {{ISBN|1-4051-3413-5}}.</ref>