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The periaqueductal grey is a column of grey matter that surrounds the cerebral aqueduct of Sylvius in the midbrain.
References
Hattingh C, Hacking C, Al Kabbani A, et al. Periaqueductal grey matter. Reference article, Radiopaedia.org (Accessed on 27 Feb 2024) https://doi.org/10.53347/rID-34472