Anatomy
The basilar artery supplies the brainstem from medulla upwards.
It is formed by the union of the two vertebral arteries. It runs forwards and divides into posterior cerebral arteries and posterior communicating arteries which run forward to join the anterior circulation of the circle of Willis.
It's principal branches are:
- posterior cerebral arteries
- long circumflex branches - superior cerebellar and anterior inferior cerebellar arteries
- paramedian branches
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