Note: occasionally, a small vertebral artery will terminate into a common AICA-PICA complex. Microsurgical anatomy of their extracerebral segments.
Perforating branches of the middle cerebral artery. The posterior inferior cerebellar artery gives off the following arteries: The posterior inferior cerebellar artery arising from the extracranial segment of the internal carotid artery via the hypoglossal canal without an interposed segment of the basilar artery. Supplies the vermis and adjacent hemisphere The main trunk of the posterior inferior cerebellar artery usually bifurcates somewhere along the margin of the cerebellar tonsil into It was noted that AICA originated in the lower third part of basilar artery 1.5. Posterior inferior cerebellar artery (PICA) occlusion may cause infarction of any part of the vascular territory of the PICA, namely the posterior inferior cerebellum, inferior cerebellar vermis, and lateral medulla. Supplies branches to the cerebellar surface AICA and PICA had no significant differences of the studied parameters. The clinical syndrome of PICA occlusion (Wallenberg and its various partial forms), a.k.a. Marks the transition between the proximal (medulla-supplying) and distal (cerebellum-supplying) parts of the posterior inferior cerebellar arteryĬourses in the cleft between the tela choroidea, inferior medullary velum rostrally, and superior pole of the cerebellar tonsil caudallyĬontains the cranial loop, also known as the choroid point or choroid arch, an upward convex loop that has a constant relation to the 4 th ventricle and gives rise to choroidal arteries PICA occlusion and the lateral medullary syndrome.
Variably courses (ascending or descending) along the side of the medulla near or between the origins of the 9 th, 10 th, and 11 th cranial nerve rootsĬourses along the posterolateral surface of the medulla and inferior cerebellar tonsilĬontains the caudal loop, a downward convex loop that mostly remain superior to the foramen magnum but occasionally extend below it 6,7:Ĭourses along the front of the medulla at the level of the inferior olive The anterior communicating artery (AComm) is a short, slender vessel that runs horizontally between the anterior cerebral arteries. The segmental anatomy was defined microsurgically by Lister et al. Occasionally arises from a common origin with the anterior inferior cerebellar artery ~20% arise extracranially, inferior to the foramen magnumġ0% arise from the basilar rather than vertebral artery The PICA is a paired artery that originates from the vertebral artery V4 segment.
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