anterior cerebral artery
Definition: one of the two terminal branches (with middle cerebral artery) of the internal carotid; it passes anteriorly, loops around the genu of the corpus callosum, and then passes posteriorly in the longitudinal fissure along with its fellow of the opposite side, the two being joined by the anterior communicating artery [TA]. For descriptive purposes, it is divided into two parts: 1) the precommunicating part [TA] (A1 segment in clinical terminology), which gives rise to the anteromedial central arteries [TA], consisting of proximal medial striate arteries [TA], the supraoptic artery [TA], anterior perforating arteries [TA], and preoptic arteries [TA] and 2) a postcommunical part [TA] (A2 segment), which gives rise to a distal medial striate artery [TA], medial frontobasal artery [TA], polar frontal artery [TA], and two large terminal branches: the pericallosal artery [TA] and the callosomarginal artery [TA]. The latter two have branches that serve specific regions of the cortex.
Synonym(s): arteria cerebri anteriorTA