Update: We are now collecting Disclosures from all users who edit content. You will be prompted to update these when you next edit content or you can complete your disclosures at any time in your user profile. This has been reflected in an updated terms-of-use.

L sign (brain)

Last revised by Dr Bahman Rasuli on 26 Feb 2021

The L sign is one of the features useful in identifying the central sulcus on cross-sectional imaging.

On axial images, the superior frontal gyrus at its posterior aspect meets the precentral gyrus in an "L" configuration (forwards on the left, backward on the right). The central sulcus is the next posterior sulcus 1.

See also

ADVERTISEMENT: Supporters see fewer/no ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.