Extra-axial masses (e.g. acoustic schwannomas or meningiomas) would displace the vessel whereas intra-axial masses tend not to. medial branch supplies the biventral lobuleīefore cross-sectional imaging, the AICA (along with venous displacement) was used to identify posterior fossa intra- or extra-axial masses especially at the CP angle.lateral branch passes around the flocculus and into the hemispheric fissure (supplying both superior and inferior semilunar lobules).internal auditory branch (80% single, 20% double) passes into the internal acoustic meatus.It passes backwards to the anterior surface of the cerebellum. anteroinferior surface of the cerebellumĩ9% of AICAs arise from the basilar artery with around 75% coming from the lower third.It has a variable origin, course and supply, with up to 40% of specimens not having an identifiable standard AICA due to PICA-AICA dominance. The anterior inferior cerebellar artery (AICA) is another vessels that provides arterial blood supply to the cerebellum. anastomose with inferior vermian branches of the PICA.arise from the lateral (marginal) branch and from the SCA distal to the origin of the lateral branch also from the ambient segment.gives off hemispheric branches that course superiorly over the superior cerebellar hemisphere.runs posteriorly in the region of the interhemispheric fissure.usually arises from the ambient segment.quadrigeminal segment: continues on the upper surface of the cerebellum.ambient segment: winds around the cerebral peduncle, close to the trochlear nerve.prepontine segment: It passes lateralward, immediately below the oculomotor nerve, which separates it from the posterior cerebral artery.The upper branch, when multiple, may arise from the PCA and usually supplies the vermis, whereas the lower branch supplies the hemisphere. Unlike the anterior inferior cerebellar artery (AICA) and posterior inferior cerebellar artery (PICA) the SCA is usually present but, it is frequently duplicated: inferior colliculus by the quadrigeminal segment) whole superior surface of the cerebellar hemispheres down to the great horizontal fissure.The superior cerebellar artery (SCA) arises from the distal basilar artery, just below the posterior cerebral artery (PCA) and typically supplies the superior half of the cerebellum, and the midbrain.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |