M sign (inferior frontal gyrus)
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At the time the article was created Frank Gaillard had no recorded disclosures.View Frank Gaillard's current disclosures
At the time the article was last revised Daniel J Bell had no recorded disclosures.View Daniel J Bell's current disclosures
The M sign refers to the characteristic "M" configuration of the inferior frontal gyrus, as it forms (from front to back) the pars orbitalis, pars triangularis, and, pars opercularis.