The coronary sinus provides venous drainage to the myocardium. There is, however, direct drainage into the ventricles as well.
To drain the tissues of the heart and empty into the coronary sinus
The renal vein carries blood away from the kidney and back towards the heart.
Firstly blood returns to the heart by the continuous pumping of the heart itself as blood is continously pushed from the chambers of the heart. Secondly the veins have valves which prevent the blood from flowing backwards. Thirdly the contraction of the muscles help to push the blood back to the heart. Hope this helps.
subclavian vein
the main function of a renal vein is to carry urine to the kidneys
The Testicular Vein and then into the Penisial Vein.
The blood travels through the digital veins, the superficial palmar veins which drain into the cephalic vein, the median cubital vein, the basilic vein, the axillary vein, the subclavian vein, the brachiocephalic vein, and the superior vena cava to go to the right atrium.
Middle cardiac (and posterior vein of left ventricle) *both drain in coronary sinus*
drain into the Azygos vein.
The two major veins which drain the leg are 1) the femoral vein, and 2) the saphenous vein.
The azygos vein and the hemiazygos vein drain into the superior vena cava. The blood will then travel from along the superior vena cava to enter the right atrium.
Probably the inf mesenteric vein