The term area 40 of Brodmann refers to a subdivision of the cytoarchitecturally defined parietal region of cerebral cortex in the human. It is located primarily in the supramarginal gyrus surrounding the posterior ascending limb of the lateral fissure (human). It is bounded approximately by the intraparietal sulcus, the inferior postcentral sulcus the posterior subcentral limb of the lateral fissure and the lateral fissure. Cytoarchitecturally it is bounded caudally by the area 39 of Brodmann, rostrally and dorsally by the area 2 of Brodmann (human), and ventrally by the area 43 of Brodmann (human) and the area 22 of Brodmann (human) ( Brodmann-1909 ). Its equivalent in the nomenclature of Glasser-2016 is areas PF.