The term area FD gamma of Bonin refers to an area of cerebral cortex defined on the basis of cytoarchitecture in the macaque. Located in the rostral bank of the inferior ramus of the arcuate sulcus and adjacent cortical surface, area FD gamma was distinguished from area FD of Bonin by a more prominent distribution of "big cells in iiic and va." The authors regarded it as the same as area 45 of Walker and area 8 of Vogts and homogous to area FD gamma of Economo and triangular area 45 of Brodmann (human) ( Bonin-1947 ).