Study was performed on 83 great and 64 small saphenous veins obtained from human adults males and females, aged 26 to 85 years. The number of valves in the great saphenous veins varies from 3 to l3, and in the small saphenous veins the number of valves varies from 1 to 8. The mean number of valves in the femoral part of the great saphenous veins is 5 and in the crural part of this vein is 3. The number of valves is not related to the length of vein.