PATHOLOGY

Detailed explanation-1: -Coronary veins are responsible for draining deoxygenated blood from the myocardium into the cardiac chambers. Comprised of two venous systems, coronary veins classify into either the greater cardiac venous system or the smaller cardiac venous system.

Detailed explanation-2: -The coronary sinus receives drainage from most epicardial ventricular veins, including the oblique vein of the left atrium (and other left and right atrial veins), the great cardiac vein, the posterior vein of the left ventricle, the left marginal vein, and the posterior interventricular vein.

Detailed explanation-3: -false. Although the coronary sinus is involved in draining deoxygenated blood from the muscular walls of the heart, it does not drain it into the left atrium. In fact, the coronary sinus will drain the deoxygenated blood into the right atrium of the heart.