The term area FDE of Bonin refers to an area of cerebral cortex defined on the basis of cytoarchitecture in the macaque. It is located at the frontal pole. A part of area FD of Bonin, it differs from the rest of area FD in that it is thinner and the cells are somewhat smaller. The authors did not delineate it in their map of cortical area ( Bonin-1947 ).