Postero-lateral sulcus of medulla oblongata
Encyclopedia
The accessory, vagus, and glossopharyngeal nerve
Glossopharyngeal nerve
The glossopharyngeal nerve is the ninth of twelve pairs of cranial nerves . It exits the brainstem out from the sides of the upper medulla, just rostral to the vagus nerve...

s correspond with the posterior nerve roots, and are attached to the bottom of a sulcus
Sulcus (anatomy)
A sulcus is a depression or fissure in the surface of an organ, especially the brain.-Elsewhere:* anterior interventricular sulcus* calcaneal sulcus* coronal sulcus* gingival sulcus* gluteal sulcus* interlabial sulci...

named the postero-lateral sulcus (or dorsolateral sulcus).
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