Definition: formed by union of the intracranial portions of the two vertebral arteries; runs along the clivus in the subarachnoid space from the lower to the upper border of the pons, where it bifurcates into the two posterior cerebral arteries; branches, anterior inferior cerebellar artery [TA], pontine arteries [TA], mesencephalic arteries [TA], superior cerebellar artery [TA], and posterior cerebral artery [TA].
Synonym(s): arteria basilarisTA
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