Anterior inferior cerebellar artery
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The anterior inferior cerebellar artery (AICA) is one of three vessels that provides arterial blood supply to the cerebellum. It has a variable origin, course and supply, with up to 40% of specimens not having an identifiable standard AICA. The amount of tissue supplied by the AICA is variable (AICA-PICA dominance) but usually includes:
- middle cerebellar peduncle
- inferolateral portion of the pons
- flocculus
- anteroinferior surface of the cerebellum
- cranial nerves VII and VIII
OriginÂ
99% of AICAs arise from the basilar artery, but where along the vessel is variable:
- 75% lower third
- 16% middle third
- 9% vertebrobasilar junction
Branches
- internal auditory branch (80% single, 20% double) passes into the IAM
- lateral branch passes around the flocculus and into the hemispheric fissure (supplying both superior and inferior semilunar lobules)
- medial branch supplies the biventral lobule
Before 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. Extra-axial masses (e.g. vestibular schwannomas or meningiomas) would displace the vessel whereas intra-axial masses tend not to.
-</ul><p>Before cross-sectional imaging, the AICA (along with venous displacement) was used to identify posterior fossa intra- or extra-axial masses, especially at the <a href="/articles/cerebellopontine-angle-mass">CP angle</a>. Extra-axial masses (e.g. <a title="Vestibular schwannoma" href="/articles/vestibular-schwannoma">vestibular </a><a href="/articles/vestibular-schwannoma">schwannomas</a> or <a href="/articles/meningioma">meningiomas</a>) would displace the vessel whereas intra-axial masses tend not to.</p>- +</ul><p>Before cross-sectional imaging, the AICA (along with venous displacement) was used to identify posterior fossa intra- or extra-axial masses, especially at the <a href="/articles/cerebellopontine-angle-mass">CP angle</a>. Extra-axial masses (e.g. <a href="/articles/vestibular-schwannoma">vestibular </a><a href="/articles/vestibular-schwannoma">schwannomas</a> or <a href="/articles/meningioma">meningiomas</a>) would displace the vessel whereas intra-axial masses tend not to.</p>
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Image 6 Diagram (Arterial territories) ( create )
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