AICA supplies the anterior portion of the inferior cerebellum, the middle cerebellar peduncle, and the facial and vestibulocochlear nerves. Note: occasionally, a small vertebral artery will terminate into a common AICA-PICA complex. PICA supplies the lateral medulla, the inferior cerebellum, and the inferior cerebellar peduncle. The posterior inferior cerebellar artery gives off the following arteries: 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

Supplies branches to the cerebellar surface 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 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 Arterial supply to brain:Cerebellar arteries (SCA, AICA, PICA) arise from the lateral (marginal) branch and from the SCA distal to the origin of the lateral. Typically, the PICA may supply: posteroinferior. 6,7:Ĭourses along the front of the medulla at the level of the inferior olive It is the most variable cerebral artery and has a variable territory depending on the size of the AICA. 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. Several hypotheses have been put forth to explain the pathogenesis: 305307 (1) unilateral supply to both medial PICA territories, (2) both PICAs arising from an occluded BA, (3) pressure effect is caused by a large PICA infarct, (4) hemodynamic mechanism with hypoperfusion in the most peripheral branches, and (5) double, simultaneous embolic st.

Pica artery supplies