artery outer diameter middle cerebral artery outer diameter MCA outer diameter clinical_measurement_ontology MCA external diameter The length of a line which crosses a transverse view of a middle cerebral artery, passing through its center and ending on either side at the outer surface of the blood vessel wall. The middle cerebral arteries are the largest of the cerebral arteries and supply blood to the lateral cerebral cortex, anterior temporal lobes and insular cortices of the brain. 2021-01-04T17:10:09Z slaulede CMO:0003625 VT:0010921 PMID:22508433 middle cerebral artery external diameter