is the precentral sulcus where area 6 begins. Receptorarchitectonic work subdivides BA4 into a posterior field (4p) concentrated along the sulcal wall and an anterior field (4a) on the gyral crown. Area 6 lies anterior to BA4 across the superior and middle frontal gyri and includes the lateral premotor cortex; on the medial wall it encompasses the supplementary and pre-supplementary motor areas.

Nomenclature variants

Human and non-human primate atlases differ in labeling schemes across anterior agranular cortex. In macaques,

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