Editing Arachnoid granulation (section)

=== 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" />