<P> 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 . </P>
<P> 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 . </P>
villi that absorb csf into the venous circulation
villi that absorb csf into the venous circulation
Arachnoid granulations
Arachnoid granulations