THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The great cardiac vein, the middle cardiac vein, and the small cardiac vein all drain into the coronary sinus (which opens into the right atrium). The anterior cardiac veins drain directly into the right atrium.

Detailed explanation-2: -Unlike most cardiac veins, the anterior cardiac veins not end in the coronary sinus; instead, they drain directly into the anterior wall of the right atrium.

Detailed explanation-3: -The main vessels entering the right atrium are the superior vena cava, and the inferior vena cava. These are the major vessels that return blood from the systemic circulation back into the heart.

Detailed explanation-4: -The anterior cardiac veins, also known as the anterior cardiac veins of right ventricle, are the small parallel veins found on the anterior surface of the right ventricle. The function of the anterior cardiac veins is to drain the upper anterior portion of the myocardium of the right ventricle.