NEET PG Medical – 2015 – Question – 44
Which of the following does not directly drain into right atrium ?
a) Great cardiac vein
b) Anterior cardiac vein
c) Thebasian vein
d) Venae cordis minimi
Correct Answer – A
Ans. (A) Great cardiac vein
Great cardiac vein does not directly drain into right atrium. It drains into coronary sinus, which in turn drains into right atrium.
Veinous drainage of heart
Coronary sinus : Opens into right atrium and has following tributaries : (i) Great cardiac vein, (ii) Middle cardiac vein, (iii) Posterior vein of left ventricle, (iv) Small cardiac vein, (v) Oblique vein of left atrium and (vi) Sometimes right marginal vein.
Anterior cardiac vein : Opens into right atrium.
Venae cardis minimi (thebasian veins) : All these are extremely small veins in the walls of all the 4 chambers of the heart. They open directly into the respective chambers. They’re most numerous in the right atrium.
Right marginal vein : More often opens into right atrium but sometimes into coronary sinus.
