Sylvian cistern
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http://purl.obolibrary.org/obo/UBERON_0011155
The subarachnoid space associated with the lateral cerebral sulcus (Sylvian fissure); contains the M1 segment of the middle cerebral artery and the origin of lenticulostriate arteries, and proximal parts of the middle cerebral artery [ http://www.mondofacto.com/facts/dictionary?Sylvian+cistern ]