sulcus limitans sulcus limitans the sulcus limitans is found in the fourth ventricle of the brain. it separates the cranial nerve motor nuclei (medial) from the sensory nuclei (lateral). it can also be located by searching laterally from the medial eminence. it is parallel to the median sulcus. this article is about the structure in the fourth ventricle. for the structure in the developing nervous system, see sulcus limitans (neural tube). sulcus limitansrhomboid fossa. (sulcus limitans not labeled, but region is visible.)human caudal brainstem posterior view (the sulcus limitans separates #2 from #4.)detailsidentifierslatinsulcus limitans fossae rhomboideaeneuronames629anatomical terms of neuroanatomy