pos·te·ri·or me·di·an sul·cus of me·dul·la ob·lon·ga·ta
[TA] the longitudinal groove marking the posterior midline of the medulla oblongata; continuous below with the posterior median sulcus of the spinal cord. Synonym(s): sulcus medianus posterior medullae oblongatae [TA], dorsal median sulcus ☆ , posterior median fissure of the medulla oblongata