Figure 1.

Boundaries of the paracentral lobule in respect to the intercommissural or anterior commissure–posterior commissure line; AC – Anterior commissure; PC – Posterior commissure; X axis – Anterior commissure–posterior commissure line; Xa – Line defines inferior boundary of the paracentral lobule in case of segmented paracentral lobule; Y axis-vertical line intersecting the anterior commissure–posterior commissure line; Ya – Line that defines the anterior boundary of the paracentral lobule; CS – Medial extension of central sulcus; CSp – Medial extension of precentral sulcus; CSsf – Cingulate sulcus (subfrontal part); MS – Cingulate sulcus (marginal part); CG – Cingulate gyrus; Right hemisphere. Orientation: A – Anterior; P – Posterior; S – Superior; I – Inferior