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Reference.org
Subarachnoid cisterns
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<p>The subarachnoid cisterns are spaces formed by openings in the <a href="/facts/Subarachnoid_space/IcxhShYH">subarachnoid space</a>, an <a href="/facts/Anatomic_space/1RTUswMU">anatomic space</a> in the <a href="/facts/Meninges/IcxhShYH">meninges</a> of the <a href="/facts/Brain/EKla9NkJ">brain</a>. The space is situated between the <a href="/facts/Leptomeninges/IcxhShYH">two meninges</a>, the <a href="/facts/Arachnoid_mater/fmWI3KT0">arachnoid mater</a> and the <a href="/facts/Pia_mater/8Kt6sdD1">pia mater</a>. These cisterns are filled with <a href="/facts/Cerebrospinal_fluid/tcWG7hhv">cerebrospinal fluid</a> (CSF). </p>