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Arachnoid granulations (also arachnoid villi, and pacchionian granulations or bodies) are small outpouchings of the arachnoid mater and subarachnoid space into the dural venous sinuses of the brain. The granulations are thought to mediate the draining of cerebrospinal fluid (CSF) from the subarachnoid space into the venous system .
Extending from the subarachnoid space to the dural venous sinuses of the brain are small outpouchings or protrusions known as arachnoid granulations. Arachnoid granulations are pockets of arachnoid membrane and subarachnoid space which connect cerebrospinal fluid to venous circulation.
Arachnoid granulations, also known as Pacchionian granulations, are projections of the arachnoid membrane (villi) into the dural sinuses that allow CSF to pass from the subarachnoid space into the venous system.
Underneath the arachnoid is a space known as the sub-arachnoid space. It contains cerebrospinal fluid, which acts to cushion the brain. Small projections of arachnoid mater into the dura (known as arachnoid granulations) allow CSF to re-enter the circulation via the dural venous sinuses.
Arachnoid granulations (AG) (Figs. 10.1–10.3), first described in 1705 by Italian anatomist Antonio Pacchioni, are protrusions of the arachnoid mater that extend from the subarachnoid space into the venous system. AG are filled with CSF and are located along the surface of the brain.
The arachnoid granulations (Pacchionian bodies) are protrusions of the arachnoid mater that pierce the meningeal dura and protrude into the lumina of the dural venous sinuses. The core of each arachnoid granulation is continuous with the subarachnoid space, therefore, containing the cerebrospinal fluid.
Arachnoid granulations (AGs, Pacchionian bodies or granulations) are protrusions of subarachnoid space into the cerebral venous sinus lumen. On dedicated imaging, AGs may be found in 60–90% of individuals, most commonly adjacent and/or within the superior sagittal, transverse, and straight sinuses.