Basilar Sulcus Of The Brainstem, Anatomy

Description

Basilar sulcus on the ventral pons forms a midline longitudinal groove that cradles the basilar artery along the anterior surface of the brainstem. From this fixed ventral perspective, the depression runs superiorly from the pontomedullary junction toward the basilar apex at the pontomesencephalic junction, flanked laterally by the pontine eminences of the basilar part of the pons. Inferior to the pons, the ventral medulla and its paramedian contours sit in continuity, while the groove remains centered in the midline where the vertebral arteries unite to form the basilar trunk. A midline landmark. Clinically, the basilar sulcus matters because it marks the surface course of the basilar artery, the parent vessel for pontine perforators that supply the basis pontis and tegmentum, territories classically involved in basilar thrombosis and ventral pontine infarction with locked-in syndrome. Teaching the relationship between the basilar artery and the pons is easier when the groove is emphasized, since learners can anchor the origins of the anterior inferior cerebellar arteries and superior cerebellar arteries to the same ventral corridor and then relate them to cerebellopontine angle and posterior fossa vascular pathology. The midline placement also supports surgical and endovascular orientation by tying surface anatomy to clival and prepontine cistern landmarks without relying on a sectional plane. Use this illustration for neuroanatomy instruction on the metencephalon, for stroke education modules focused on posterior circulation syndromes, and for medical publishing figures accompanying basilar artery occlusion, aneurysm, or perforator infarct discussions. It also fits neurosurgical and neuroradiology slide decks when correlating ventral brainstem surface landmarks with CTA, MRA, and angiographic basilar artery runs. Anatomical accuracy verified by SciePro's Medical Advisory Board.