U sign (central sulcus)

Last revised by Dr Daniel J Bell on 14 Oct 2020

The U sign denotes the characteristic U-shaped appearance of the subcentral gyrus which surrounds the inferolateral end of the central sulcus and abuts the lateral (Sylvian) fissure. It has been found, at least in one study, to be the most reliable anatomical feature to identify the central sulcus 1.

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