Ambient cistern
The ambient cistern is part of the subarachnoid cisterns. It is a thin, sheet-like extension of the quadrigeminal cistern that extends laterally around the midbrain. It acts as the connection between the quadrigeminal cistern and the interpeduncular cistern.
The term "ambient cistern" may be used to refer the these connections and the quadrigeminal cistern as a whole.

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