Editing Arachnoid granulation (section)

== Anatomy ==
The granulations are often situated near where cerebral veins drain into the dural sinuses. They are most prominent along the superior sagittal sinus, particularly those lodged within the [[Lateral lacuna|lateral lacunae]]. In order of decreasing frequency, the granulations occur within the: superior sagittal sinus, [[transverse sinuses]], [[Superior petrosal sinus|superior petrosal sinuses]], and [[straight sinus]].<ref name="Standring-2020">{{Cite book |last=Standring |first=Susan |url=https://www.worldcat.org/oclc/1201341621 |title=Gray's Anatomy: The Anatomical Basis of Clinical Practice |publisher=[[Elsevier]] |year=2020 |isbn=978-0-7020-7707-4 |edition=42th |location=New York |pages=413 |oclc=1201341621}}</ref>

The arachnoid granulations may be lodged within '''granular foveae''' — small pits upon the inner surface of the cranial bones.<ref name="Edwards1934">{{cite book |author=Linden Forest Edwards |url=https://books.google.com/books?id=AfzaAAAAMAAJ |title=Anatomy for physical education, descriptive and applied |publisher=P. Blakiston's son & co., inc. |year=1934 |page=80 |access-date=23 June 2012}}</ref><ref name="Morris1921">{{cite book |author=Sir Henry Morris |url=https://archive.org/details/morrisshumanana00jackgoog |title=Morris's human anatomy |publisher=P. Blakiston's son & Company |year=1921 |page=[https://archive.org/details/morrisshumanana00jackgoog/page/n976 953] |access-date=23 June 2012}}</ref>

=== Structure ===
The arachnoid granulations are local outpouchings of the arachnoid mater, as well as the [[subarachnoid space]] enclosed within it, into the dural venous sinuses. The granulations exhibit a thinner stalk that penetrates through the wall of a venous sinus, and a distended head formed within the lumen of the sinus. The head consists of a trabecular collagenous core that is largely covered by a dural cupula, except for an apical cap — some 0.3 mm in diameter — of arachnoid cells attached directly to the dural venous [[endothelium]].<ref name="Standring-2020" />

=== Development ===
The granulations develop during childhood as separate [[arachnoid villi]] gradually aggregate into macroscopic clumps.'''<ref>{{Cite book |last=Sinnatamby |first=Chummy S. |title=Last's Anatomy |publisher= Elsevier Australia|year=2011 |isbn=978-0-7295-3752-0 |edition=12th |pages=440}}</ref>'''