- segments of anterior cerebral artery
- the segments into which the anterior cerebral artery is divided; in anatomical terminology segments A1 (precommunicating part) and A2 (postcommunicating part) are recognized. In clinical terminology, the artery is described as comprising five segments, with A1 the precommunicating part and A2â€“5 constituting the postcommunicating part. The A2 segment continues from the anterior communicating artery to the genu of the corpus callosum; A3 corresponds to the pericallosal artery and continues around the genu until turning posteriorly; A4 and A5 continue posteriorly, above the plane of the corpus callosum, their division marked by the plane of the coronal fissure.
Medical dictionary. 2011.
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