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Gallery images and information: Arachnoid Granulations

  

Arachnoid granulations (also arachnoid villi , and pacchionian granulations or bodies ) are small protrusions of the arachnoid mater (the thin second layer covering the brain) into the outer membrane of the dura mater (the thick outer layer). They protrude into the dural venous sinuses of the brain, and allow cerebrospinal fluid (CSF) to exit the subarachnoid space and enter the blood stream.