inferior frontal sulcus inferior frontal sulcus the inferior frontal sulcus is a sulcus between the middle frontal gyrus and the inferior frontal gyrus. inferior frontal sulcuslateral surface of left cerebral hemisphere, viewed from the side.lateral surface of left cerebral hemisphere, viewed from above.detailsidentifierslatinsulcus frontalis inferiorneuronames63neurolex idbirnlex_1619ta98a14.1.09.117ta25453fma83757anatomical terms of neuroanatomy