principal veins of the human body: 1 external jugular vein, 2 internal jugular vein, 3 subclavian vein, 4 cephalic vein, 5 axillary vein, 6 great cardiac vein, 7 brachial vein, 8 basilic vein, 9 median cubital vein, 10 splenic vein, 11 inferior mesenteric vein, 12 median antebrachial vein, 13 digital vein, 14 popliteal vein, 15 posterior tibial vein, 16 peroneal vein, 17 anterior tibial vein, 18 great saphenous vein, 19 femoral vein, 20 external iliac vein, 21 internal iliac vein, 22 common iliac vein, 23 superior mesenteric vein, 24 hepatic portal vein, 25 renal vein, 26 inferior vena cava, 27 hepatic vein, 28 small cardiac vein, 29 pulmonary artery, 30 superior vena cava, 31 brachiocephalic vein