"origin: termination of the internal carotid artery"
"course: from the medial end of the lateral fissure stem to the corpus callosum"
"supply: the corpus callosum, the septum pellucidum, the putamen (anterior portion), the head of the caudate nucleus, and parts of the internal capsule"
"A1: horizontal or pre-communicating segment"
"A2: vertical, post-communicating or infracallosal segment"
"infraoptic ACA: A1 travels inferiorly or through the optic nerve 13"
Expected headings
"Segments"
"Terminal (cortical) branches"
"Central branches"
"The pericallosal artery refers either to the distal part of the ACA starting from A2 (after the origin of the anterior communicating artery) or from A3 (defined after the origin of the callosomarginal artery). In the former case, the A2, A3, and A4-5 segments refer to proximal, middle, and distal segments of the pericallosal artery, respectively 11,12."
"There are two main branching patterns of the anterior cerebral artery. In the first, the A2 gives off the callosomarginal artery (which lies in the cingulate sulcus) and continues as the pericallosal artery. In this configuration, the terminal (cortical) branches arise from the callosomarginal artery."
"Orbital branches, 2 or 3 in number, branch over the orbital surface of the frontal lobe, supplying:"
"azygos ACA: ACA territories supplied by a single A2 trunk; incidence of ~2% (range 0.2-4%)"
"ACA trifurcation: three A2 segments; incidence of ~7.5% (range 2-13%)"
"bihemispheric ACA: a hypoplastic A2 segment with contralateral A2 segment dominance supplying both ACA territories; incidence of ~4.5% (range 2-7%)"