posterolateral sulcus of medulla oblongata

{{Short description|Groove in the brainstem}}

{{Infobox brain

| Name = Posterolateral sulcus of medulla oblongata

| Latin = sulcus posterolateralis medullae oblongatae

| Image = Gray681.png

| Caption = Hind- and mid-brains; postero-lateral view.

| Image2 = Gray687.png

| Caption2 = Section of the medulla oblongata through the lower part of the decussation of the pyramids. {{ordered list |style=text-align: left; |Anterior median fissure |Posterior median sulcus |Anterior column (in red), with 3’, anterior root |Posterior column (in blue), with 4’, posterior roots |Lateral cerebrospinal fasciculus |Posterior 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.

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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).