Paraconal interventricular branch

The paraconal interventricular branch (Pc; Anterior interventricular artery in humans) is one of the principal branches of the left coronary artery in domestic mammals. It originates from the left coronary artery shortly after the latter arises from the left aortic sinus. From its origin, it courses along the paraconal interventricular groove, running obliquely toward the cardiac apex.

Along its path, the paraconal interventricular branch gives off numerous collateral branches. These include ventricular branches that supply the myocardium of both the left and right ventricles, and septal branches that penetrate the interventricular septum to vascularize its cranial portion. It also commonly provides branches to the conus arteriosus and the adjacent regions of the ventricular walls.

The paraconal interventricular branch extends toward the apex of the heart, where it may anastomose with branches of the subsinuosal interventricular branch. The extent and exact distribution of this anastomosis can vary depending on the species and the dominance pattern of coronary circulation.

Functionally, the paraconal interventricular branch is responsible for supplying a substantial portion of the left ventricular myocardium, part of the right ventricle, and a significant segment of the interventricular septum.