Subarachnoid cisterns
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The subarachnoid cisterns are discrete named spaces within the subarachnoid space where the pia mater and arachnoid membrane are not in close approximation. The subarachnoid tissue is not as abundant here as in the normal subarachnoid space and cerebrospinal fluid (CSF) gathers to form pools or cisterns (Latin: "box"). Being within the subarachnoid space, the cisterns may have vessels and/or cranial nerves passing through them.
The named subarachnoid cisterns are:
- cisterna magna: the largest of the subarachnoid cisterns
- prepontine cistern: anterior to the pons
- suprasellar cistern: surrounding the infundibulum
- interpeduncular cistern: between the cerebral crura
- quadrigeminal cistern: superior cistern or cistern of the great cerebral vein
- ambient cistern: surrounds the back of the midbrain
- cerebellopontine cistern: at the cerebellopontine angle
- premedullary cistern: anterior to the medulla
- sylvian cistern: superficial to the insular cortex
Loss of one or more of the cisterns is a sign of increased intracranial pressure. Loss of symmetry of one or more of the cisterns may be a sign of midline shift.
-<a href="/articles/missing">premedullary cistern</a>: anterior to the medulla</li>- +<a href="/articles/peroneus-brevis-1">premedullary cistern</a>: anterior to the medulla</li>
- +<li>
- +<a title="sylvian cistern" href="/articles/sylvian-cistern">sylvian cistern</a>: superficial to the insular cortex</li>
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