What is the role of your saphenous vein for heart bypass surgery?

The bypass tube: The greater saphenous vein and occasionally the lesser saphenous vein ( superficial veins in the leg ) are the usual "tubes" used for coronary artery bypass and frequently for other artery bypass operations.

Bypass conduit: Internal thoracic arteries and saphenous veins are used to bypass the obstructed native coronaries. Depending on location and number if diseased vessels , more length of vein may be harvested, prepared , reversed due to intrinsic valves, and sewn to aorta as inflow, and to distal coronary to provide new flow to heart.