The middle cardiac vein is located at the -: (A) Anterior interventricular sulcus, (B) Posterior interventricular sulcus, (C) Posterior AV groove, (D) Anterior AV groove
Answer is B. In Coronary sulcus
-        Great cardiac vein, small cardiac vein, coronary sinus, right coronary artery, left circumflex artery
 In anterior interventricular sulcus
-        Great cardiac vein, left anterior descending artery
 In posterior interventricular sulcus
-        Middle cardiac vein, posterior interventricular branch of right coronary artery