The more medial part of the superior frontal gyrus is distinguished as the paracentral lobule. It is continuous with the precentral and postcentral gyri of the lateral surface. It includes portions of the frontal and parietal lobes :
The anterior portion of the paracentral lobule is part of the frontal lobe and is often referred to as the supplementary motor area.
The posterior portion is considered part of the parietal lobe and deals with somatosensory of the distal limbs.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).