Marginal sulcus

Last edit by Alaric Steinmetz on

Synonyms: ramus marginalis, marginal sulcus

The marginal sulcus is a sulcus of the parietal lobe.

Anatomy

The marginal sulcus is the end of the cingulate sulcus and is therefore also referred to as ramus marginalis. The marginal sulcus is located between the paracentral lobule and the precuneus.

Figure

Marginal sulcus
Illustration of the marginal sulcus (marked in red) in a sagittal image of the brain.

Imaging

Bracket sign for identification of the central sulcus
Axial T1 MRI with the bracket sign in blue, which represents the marginal sulcus. The bracket sign represents the extension of the cingulate sulcus, which is referred to as the ramus or marginal sulcus. Directly anterior to the bracket sign is the central sulcus (marked in red).

Clinical Relevance

In axial MRI imaging, the marginal sulcus can be used as a landmark for the identification of the central sulcus. The central sulcus is the sulcus located anteriorly to the marginal sulcus[^1].