posterolateral sulcus of medulla oblongata posterolateral sulcus of medulla oblongata the accessory, vagus, and glossopharyngeal nerves correspond with the posterior nerve roots, and are attached to the bottom of a sulcus named the posterolateral sulcus (or dorsolateral sulcus). posterolateral sulcus of medulla oblongatahind- and mid-brains; postero-lateral view.section of the medulla oblongata through the lower part of the decussation of the pyramids. anterior median fissureposterior median sulcusanterior column (in red), with 3’, anterior rootposterior column (in blue), with 4’, posterior rootslateral cerebrospinal fasciculusposterior funiculus the red arrow, a, a’, indicates the course the lateral cerebrospinal fasciculus takes at the level of the decussation of the pyramids;the blue arrow, b, b’, indicates the course which the sensory fibers take.detailsidentifierslatinsulcus posterolateralis medullae oblongataeneuronames706ta98a14.1.04.012ta25991fma75608anatomical terms of neuroanatomy additional images human caudal brainstem posterior view description