The term area 22a gamma of Vogts refers to one of three parts of area 22a of Vogts defined on the basis of cytoarchitecture and myeloarchitecture in the guenon. It differs from area 22a alpha of Vogts and area 22a beta of Vogts in that its layer III is widest and its layer IV is thinner and less cellular than in the other two parts ( Vogts-1919 ).