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  • refers to a superficial feature of the frontal lobe identified by dissection. Found in about half of human brains, it is a groove located low on the lateral surface of the lobe, where it parallels the ventral surface of the orbital gyri ( Ono-1990 ). In the macaque it is a short sloping groove embedded rostrally in the inferior frontal gyrus at its margin with the orbital gyri ( Martin-2000 ). Some macaques lack a sulcus but have an infraprincipal dimple between the principal sulcus and the lower margin of the frontal lobe at about the same anterior-posterior level. Equivalent structures to not appear in the smooth cerebral cortex of the rat or mouse.
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