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The posterior cerebral artery arises near the intersection of the posterior communicating artery and the basilar artery and connects with the ipsilateral middle cerebral artery (MCA) and internal carotid artery via the posterior communicating artery (PCommA).
The PCA is divided into four segments:
Note that it seems that P3 and P4 segment seems to have different meanings between Terminologia Anatomica and neurosurgical/neuroradiologic textbooks :
In the Terminologia anatomica:
In neurosurgical/neuroradiologic textbooks: