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| Basilar artery | |
|---|---|
| Name | Basilar artery |
| Latin | Arteria basilaris |
| Source | Vertebral arteries |
| Branches | Posterior cerebral artery, Pontine arteries, Superior cerebellar artery, Anterior inferior cerebellar artery |
| Supplies | Brainstem, Cerebellum, Occipital lobes |
Basilar artery The basilar artery is a midline intracranial artery formed by the confluence of the two Vertebral arterys that provides principal arterial supply to the Brainstem, Cerebellum, and parts of the Occipital lobe and Thalamus. It courses along the ventral surface of the pons, gives off paramedian and circumferential branches, and terminates by bifurcating into the Posterior cerebral arterye. Occlusion, dissection, or aneurysm of the basilar artery can produce catastrophic syndromes described in classic reports from institutions such as Mayo Clinic, Johns Hopkins Hospital, and historical series by investigators at Massachusetts General Hospital.
The basilar artery arises at the pontomedullary junction from the fusion of the left and right Vertebral arterys and runs superiorly on the ventral surface of the Pons to bifurcate into the bilateral Posterior cerebral arterye near the posterior aspect of the Pituitary gland and Cerebral peduncle. Major branches include paramedian pontine branches that supply the corticospinal tracts implicated in syndromes reported in case series from Harvard Medical School and circumferential branches including the Anterior inferior cerebellar artery and Superior cerebellar artery which connect with cerebellar territories studied at Karolinska Institutet. Watershed zones at the junctions with perforators have been mapped in atlases from Gray's Anatomy and studies at University College London.
Embryologic formation of the basilar artery involves longitudinal neural arteries that anastomose with the bilateral Vertebral arterys during the fourth to eighth weeks of gestation, a process detailed in embryology texts from Guy's Hospital and research at University of Cambridge. Variations such as a persistent trigeminal artery or hypoplastic vertebral contribution reflect incomplete regression of fetal carotid–vertebrobasilar anastomoses first described in reports from St Thomas' Hospital and documented in series from University of Tokyo.
The basilar artery supplies crucial blood flow to nuclei and tracts within the Pons including the corticospinal fibers, cranial nerve nuclei studied at Columbia University Irving Medical Center, and cerebellar peduncles connecting to the Cerebellum described in monographs from University of Oxford. Through its terminal Posterior cerebral artery branches it also contributes to perfusion of the Occipital lobe visual cortex implicated in visual field deficits characterized in literature from Johns Hopkins Hospital and Mayo Clinic.
Basilar artery occlusion causes basilar artery thrombosis syndromes with presentations ranging from isolated cranial nerve palsies to locked-in syndrome, reported in landmark series from Massachusetts General Hospital and Mayo Clinic. Aneurysms at the basilar apex produce subarachnoid hemorrhage patterns managed in guidelines from American Heart Association and outcomes studied in trials at Mount Sinai Hospital and Cleveland Clinic. Dissection of the vertebrobasilar system may extend to the basilar artery, a pathology described in registries from European Stroke Organization and case reports from University of California, San Francisco.
Noninvasive techniques include time-of-flight Magnetic Resonance Angiography (MRA) and contrast-enhanced MRA protocols developed at Stanford University as well as computed tomography angiography (CTA) routinely used in emergency pathways at Royal Free Hospital. Digital subtraction angiography (DSA) at centers like National Institutes of Health remains the gold standard for characterizing basilar artery stenosis, aneurysm morphology, and collateral circulation, with perfusion imaging sequences from University of Pennsylvania aiding decision-making in reperfusion therapies.
Endovascular approaches such as stent-assisted coiling for basilar apex aneurysms and mechanical thrombectomy for acute basilar artery occlusion have been advanced by multicenter trials including investigators from European Stroke Organization and North American Neuroendovascular Society. Microsurgical clipping of basilar bifurcation aneurysms has historical provenance at Mayo Clinic and Barrow Neurological Institute, while bypass and skull base approaches were refined by teams at University of Pittsburgh Medical Center and Cleveland Clinic Foundation. Perioperative care often follows protocols from American Stroke Association and consensus statements from World Federation of Neurosurgical Societies.
Anatomic variants include basilar artery hypoplasia, fenestration, and bifid basilar tip, documented in radiologic series from Oslo University Hospital and Seoul National University Hospital. Persistent embryonic arteries such as the persistent trigeminal artery or hypoglossal artery create atypical basilar territory perfusion described in case reports from Hospital de la Santa Creu i Sant Pau and Charité – Universitätsmedizin Berlin. These anomalies influence collateral patterns studied in population cohorts at University of Toronto.
Category:Arteries of the head and neck