Frontal regions. shows the lateral (above) and the medial view (below) of frontal lobe segmented regions in a male subject in his 60 ties. All FreeSurfer segmented frontal lobe regions described in the text is also labelled in Figure 1. The position of the Thomsen et al. (2004b) report of reduced grey matter density for the old group was when compared to FreeSurfer regions within the caudal (or posterior) left middle frontal cortex (MFC), and the location is illustrated with a yellow ellipse on the lateral view in Figure 1.