Arachnoid granulation

Arachnoid granulation
Diagrammatic representation of a section across the top of the skull, showing the membranes of the brain, etc. ("Arachnoid granulation" label is at top right.)
Arachnoid granulations seen on autopsy, where the dura mater has been removed but the arachnoid mater is left in place.
Details
Identifiers
Latin	granulationes arachnoideae
TA98	A14.1.01.205
TA2	5389
FMA	77760
Anatomical terminology [edit on Wikidata]

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.

The largest and most numerous granulations lie along the superior sagittal sinus; they are however present along other dural sinuses as well.