The term anterior occipital sulcus refers to a superficial feature of the lateral aspect of the cerebral cortex that is seen in some human brains ( Duvernoy-1992 ). Where present, it originates in the preoccipital notch on the ventral margin of the hemisphere and marks the boundary between the temporal lobe rostrally and the occipital lobe caudally. In some cases it is seen as a branch of the inferior temporal sulcus and referred to as a 'posterior' or 'ascending limb' of that sulcus. It is not found in the macaque or in the smooth cerebral cortex of the rat or mouse ( NeuroNames ).