![]() In reported cases, when such is the case, the ipsilateral vertebral artery (VA) does not supply the PICA, and most of the time it is hypoplastic.Īwareness of the existence of an extradural origin of the PICA and a direct connection of this vessel with the occipital artery (OA) is of great relevance to the muscular stage of surgical approaches to the posterior craniovertebral junction 1). The intracranial part V4 segment (intradural) pierces the dura mater and inclines medialward to the front of the medulla oblongata it is placed between the hypoglossal nerve and the anterior root of the first cervical nerve and beneath the first digitation of the ligamentum denticulatum. The ascending pharyngeal artery (APA) may, in very rare cases, supply the posterior inferior cerebellar artery (PICA). Cerebellar Artery Syndrome) is a neurological condition caused by a blockage of the vertebral artery (VA) or posterior inferior cerebellar artery (PICA). The PICA is a paired artery that originates from the vertebral artery V4 segment. Knowledge of the functional arterial anatomy of the cerebral arteries is important to recognize and understand some of the frequent important anatomical variants and to avoid unexpected technical complications in the endovascular neuroradiological practice. The medial branch continues backward to the notch between the two hemispheres of the cerebellum while the lateral supplies the under surface of the cerebellum, as far as its lateral border, where it anastomoses with the anterior inferior cerebellar and the superior cerebellar branches of the basilar artery.īranches from this artery supply the choroid plexus of the fourth ventricle. Citation, DOI, disclosures and article data Gross anatomy. It winds backward around the upper part of the medulla oblongata, passing between the origins of the vagus and accessory nerves, over the inferior cerebellar peduncle to the undersurface of the cerebellum, where it divides into two branches. ![]() Occlusion of the posterior inferior cerebellar artery or one of its branches, or of the vertebral artery leads to Wallenberg syndrome, also called lateral medullary syndrome. The vertebral artery was present in 49 and the PICA was. The posterior inferior cerebellar artery ( PICA), the largest branch of the vertebral artery, is one of the three main arterial blood supplies for the cerebellum.įm: Foramen of Magendie imv: inferior medullary velum icp: inferior cerebellar peduncle pica: posterior inferior cerebellar artery (third and forth segments) tc: tela chorioidea tvj: telovelar junction ( yellow discontinous line). When the posterior inferior cerebellar artery (PICA) is hypoplastic, AICA takes over the territory usually supplied by the lateral branch of the PICA. The posterior inferior cerebellar artery (PICA), by definition, arose from the vertebral artery. ![]()
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