The term area 8 of Walker refers to a portion of the frontal lobe of the macaque defined on the basis of cytoarchitecture and function. It is composed of area 8A of Walker and area 8B of Walker, both of which have a "faint but definite granular layer." area 8B is further distinguished by "fairly large pyramidal cells in the fifth layer." Electrical stimulation of either component elicits eye movements. Walker regarded it as cytoarchitecturally and functionally homologous to area 8 of Brodmann (human) ( Walker-1940 ).