Figure 2: The anterior cerebral artery (ACA) arises from the bifurcation of the internal carotid artery and courses rostromedially dorsal to the optic nerve as the A1 segment. The ipsilateral and contralateral A1 segments run together and connect via the ACoA. The pericallosal arteries are defined as the segments of the ACA distal to the ACoA. They continue superiorly into the interhemispheric fissure, upward on the medial surface of the hemisphere, and then course posteriorly on the superior surface of the corpus callosum, staying mostly below the lower margin of the falx (Image courtesy of AL Rhoton, Jr).
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