posterior intermediate sulcus

pos·te·ri·or in·ter·me·di·ate sul·cus

[TA] a longitudinal furrow between the posterior median and the posterolateral sulci of the spinal cord in the cervical region, marking the gracile fasciculus from the cuneate fasciculus. Synonym(s): sulcus intermedius posterior [TA], dorsal intermediate sulcus, posterior intermediate groove