cerebral artery inner diameter anterior cerebral artery inner diameter anterior cerebral artery lumen diameter The length of a line which crosses a transverse view of an anterior cerebral artery, passing through its center and ending on either side at the inner surface of the blood vessel wall. The anterior cerebral artery (ACA) is one of a pair of arteries that supply oxygenated blood to the most medial portions of the frontal lobes and superior medial parietal lobes of the brain. 2012-10-03T05:39:47Z clinical_measurement_ontology jsmith ACA inner diameter CMO:0001127