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 ascending pharyngeal artery (APA) may, in very rare cases, supply the posterior inferior cerebellar artery (PICA). At the bottom, the Posterior Inferior Cerebellar Artery (PICA) is the latest addition to cerebellar supply, Unlike AICA and SCA, it seems to arise from the. 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. It has a variable origin, course and supply, with up to 40 of specimens not having an identifiable standard AICA. Loss of blood supply to lateral medulla Area of lesion. Infarctions in the PICA territory result in a Wallenbergs syndrome: nausea, vomiting, and vertigo ipsilateral facial numbness weakness of the ipsilateral. 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. The anterior inferior cerebellar artery (AICA) is one of three vessels that provides arterial blood supply to the cerebellum. Also known as Lateral Medullary Syndrome or Wallenberg Syndrome. 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 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). Furthermore, multiple case reports have documented that in patients with a hypoplastic vertebral artery that inserted into the PICA, there was an increased risk of rotational vertebral artery.
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