Type | Origin | Course of long LAD* | Major branches | ||
---|---|---|---|---|---|
Short LAD | Long LAD | Short LAD | Long LAD | ||
I | Proximal LAD | Proximal LAD | Epicardial course on the LV side of the proximal AIVG, reentering the distal AIVG | Septal | Diagonal |
II | Proximal LAD | Proximal LAD | Epicardial course on the RV side of the proximal AIVG, reentering the distal AIVG | Septal and diagonal | |
III | Proximal LAD | Proximal LAD | Intramyocardial course in the proximal septum, then either emerging epicardially in distal AIVG or terminating intramyocardially as septal branches. | Diagonal | Septal |
IV | LMCA | Proximal RCA | 1. Epicardial course anterior to the RVOT continuing to the distal AIVG | Septal and diagonal | |
2. Intramyocardial course within septal crest emerging epicardially in the distal AIVG | |||||
V | LCS | RCS | Intramyocardial course within the septal crest emerging epicardially in the distal AIVG | Septal and diagonal | |
VI | LMCA | Proximal RCA | Epicardial course between the RVOT and the aortic root, continuing to the mid or distal AIVG | Septal and diagonal | Diagonal |