The sulcus limitans is a groove on either side of the midline in the rhomboid fossa. It separates the cranial nerve motor nuclei (located medial), and the sensory nuclei (located lateral).Nolte, John. The Human Brain 6th ed. p.685. Mosby Inc. It is parallel to the median sulcus.
References
External links Diagram of the sulcus limitans Sectional Atlas: Pons at the Abducens Nucleus - Facial Colliculus