part of part of primary motor cortex Brodmann area Brodmann (1909) area 4 https://github.com/obophenotype/uberon/issues/515 B09-4 The term area 4 of Brodmann-1909 refers to a cytoarchitecturally defined portion of the frontal lobe of the guenon. It is located predominantly in the precentral gyrus. Brodmann-1909 regarded it as topographically and cytoarchitecturally homologous to the human gigantopyramidal area 4 and noted that it occupies a much greater fraction of the frontal lobe in the monkey than in the human. Distinctive features (Brodmann-1905): the cortex is unusually thick; the layers are not distinct; the cells are relatively sparsely distributed; giant pyramidal (Betz) cells are present in the internal pyramidal layer (V); lack of an internal granular layer (IV) such that the boundary between the external pyramidal layer (III) and the internal pyramidal layer (V) is indistinct; lack of a distinct external granular layer (II); a gradual transition from the multiform layer (VI) to the subcortical white matter. area 4 of Brodmann (guenon) giant pyramidal area Brodmann area 4 Brodmann's area 4 Wikipedia:Brodmann_area_4 UMLS:C1272526 Brodmann (1909) area 4 BA4 neuronames:1014 area 4 of Brodmann-1909 area gigantopyramidalis B09-4 UBERON:0013535 BIRNLEX:1735 Brodmann area 4, gigantopyramidal area 4 of Brodmann FMA:68600