posterior cerebral artery
Definition: formed by the bifurcation of the basilar artery; it passes around the cerebral peduncle to reach the medial aspect of the hemisphere. For descriptive purposes it is divided into three parts, consisting of four segments: 1) precommunicating part (P1 segment of clinical terminology), which gives rise to posteromedial central arteries [TA], short circumferential arteries [TA], the thalamoperforating artery [TA], and the collicular artery [TA]; 2) the postcommunicating part (P2), which gives rise to posterolateral central arteries [TA], posterior medial choroidal branches [TA], posterior lateral choroidal branches [TA], peduncular branches [TA], and the thalamogeniculate artery [TA]; and 3) the terminal or cortical part consisting of the lateral occipital artery [TA] (P3) the branches of which serve the medial aspect of the temporal lobe and the medial occipital artery [TA] (P4), with branches that serve the medial surface of the occipital lobe; the latter includes calcarine and parietooccipital arteries.
Synonym(s): arteria cerebri posteriorTA
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