Posterior interventricular artery
The posterior interventricular artery (PIV), or posterior descending artery (PDA), is an artery running in the posterior interventricular sulcus to the apex of the heart where it meets with the anterior interventricular artery. It supplies the posterior one third of the interventricular septum. The remaining anterior two thirds is supplied by the anterior interventricular artery which is a septal branch of the left anterior descending artery, which is a branch of left coronary artery.
It is typically a branch of the right coronary artery (70%, known as right dominance). Alternatively, the PIV can be a branch of the circumflex coronary artery (10%, known as left dominance) which itself is a branch of the left coronary artery. It can also be supplied by an anastomosis of the left and right coronary artery (20%, known as co-dominance). Variants have been reported.
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