=====Pars marginalis=====
{{ ::marginalsulcus.png?600|}}
The marginal sulcus, also known as pars marginalis, is the extension of the [[cingulate sulcus]] posterosuperiorly, separating the [[paracentral lobule]] from the [[precuneus]] on the medial surface of the [[cerebral hemisphere]]s.  

Visible on 95 % of [[CT]]s and 91 % of MRIs

Practical point

On axial images it appears as a short sulcus, reaching the apex but not extending laterally. It is an excellent landmark to help confirm the location of the [[central sulcus]], which is located one sulcus anterior to the [[marginal sulcus]], on the other side of the [[precentral gyrus]]. 

Located slightly posterior to the widest [[biparietal diameter]].