Middle cardiac vein

The middle cardiac vein or posterior interventricular vein is a vein of the heart which accompanies the posterior interventricular artery. It courses in the posterior interventricular groove and drains directly into the coronary sinus close to it’s termination. It drains the posterior wall of both ventricles and the posterior interventricular septum. At the cardiac apex small tributaries of the middle cardiac vein anastomose with tributaries of the great cardiac vein.