Septal branches

The septal branches of the paraconal interventricular branch arise along its course within the paraconal interventricular groove. They consist of multiple small to medium-sized arteries that penetrate perpendicularly from the main vessel into the interventricular septum usually directed caudodorsally toward the central part of the septum.

They supply the cranial two-thirds of the interventricular septum, including both muscular and, in part, conducting tissue components such as portions of the atrioventricular bundle and its branches.

The septal branches anastomose within the septum with corresponding septal branches arising from the subsinuosal interventricular branch, contributing to an intraseptal arterial network. The number, size, and exact distribution of these septal branches vary among species, but they are generally well developed in domestic mammals.