left anterior descending artery outer diameter coronary septal artery outer diameter The average length of a line which crosses a transverse view of a coronary septal artery, a branch of the left anterior descending artery that supplies blood to the interventricular septum of the heart, passing through its center and ending on either side at the outer surface of the blood vessel wall. PMID:22508433 coronary septal perforator external diameter 2021-01-04T15:36:47Z clinical_measurement_ontology coronary septal perforator outer diameter CMO:0003624 slaulede