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At the time the article was created Jeremy Jones had no recorded disclosures.View Jeremy Jones's current disclosures
At the time the article was last revised Frank Gaillard had the following disclosures:
- Radiopaedia Australia Pty Ltd and Radiopaedia Events Pty Ltd, Director, Founder and CEO (Radiopaedia) (ongoing)
- Biogen Australia Pty Ltd, Investigator-Initiated Research Grant for CAD software in multiple sclerosis: finished Oct 2021 (past)
These were assessed during peer review and were determined to not be relevant to the changes that were made.View Frank Gaillard's current disclosures
The cisterna magna (also known as the posterior cerebellomedullary cistern) is the largest of the CSF-filled subarachnoid cisterns.
The cisterna magna is located between the cerebellum and the dorsal surface of the medulla oblongata at and above the level of the foramen magnum. CSF produced in the ventricular system drains into the cisterna magna from the fourth ventricle via the median aperture (of Magendie) and the lateral apertures (of Luschka) 1,2.
Several vessels and nerves course through the lateral part of the cistern:
- vertebral arteries
- posterior inferior cerebellar arteries (PICA)
- glossopharyngeal nerve (CN IX)
- vagus nerve (CN X)
- spinal accessory nerve (CN XI)
- cisterna magna normally measures between 2-10 mm in the second and third trimesters 4
- cisterna magna normally measures 3-8 mm in the midsagittal plane when measured from the posterior margin of the foramen magnum to the caudal margin of the inferior vermis 3