Tags: Anatomical Structure.
In neuroanatomy a cistern (Latin: box) is any opening in the subarachnoid space of the brain created by a separation of the arachnoid and pia mater. These spaces are filled with cerebrospinal fluid.Although the pia mater adheres to the surface of the brain closely following the contours of its gyri and sulci the arachnoid covers only its superficial surface.
