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|Artery: Anterior interventricular branch of left coronary artery|
|Sternocostal surface of heart. (Anterior descending branch labeled at upper right.)|
|Latin||ramus interventricularis anterior arteriae coronariae sinistrae|
|Gray's||subject #142 547|
|Supplies||anterolateral myocardium, apex, interventricular septum, 45-55% of the left ventricle (LV)|
|Source||left coronary artery|
It passes at first behind the pulmonary artery and then comes forward between that vessel and the left auricula to reach the anterior interventricular sulcus, along which it descends to the incisura apicis cordis.
In 78% of cases, it reaches the apex of the heart.
The LAD gives off two types of branches: septals and diagonals.
- Septals originate from the LAD at 90 degrees to the surface of the heart, perforating and supplying the anterior 2/3rds of the interventricular septum.
- Diagonals run along the surface of the heart and supply the lateral wall of the left ventricle and the anterolateral papillary muscle.
"The Widowmaker" 
Because the LAD provides much of the bloodflow for the left ventricle, which in turn provides much of the propulsive force for ejecting oxygenated blood to systemic circulation via the aorta, blockage of this artery is particularly associated with mortality. In the medical community ischemic heart attacks associated with this blood vessel are colloquially called "the Widowmaker."
Additional images 
The arch of the aorta, and its branches.
Human heart with coronary arteries
Heart coronary territories
- anterior+interventricular+branch%20of%20left%20coronary%20artery at eMedicine Dictionary
- SUNY Labs 20:09-0102 - "Heart: The Left Coronary Artery and its Branches"
- SUNY Figs 20:03-08 - "Anterior view of the heart."
- 168165435 at GPnotebook