Objective: Anatomic observation was performed on 150 sides of adult cadavers to provide anatomic reference about the veins of the lower extremity.Methods:On 150 sides of adult cadavers

the following indexes are observed and measured: the length of great saphenous vein

femoral vein and popliteal vein;the external diameter of some special points

the quantity and shape of the venous valve.Furthermore

these data were aggregate analyzed.Results:The length of great saphenous vein

femoral vein and popliteal vein is(71.32± 0.98)cm

(29.69±0.57)cm

(13.49±2.01)cm respectively;the external diameter at the starting point of great saphenous vein is(1.12 ±0.49)cm

in the plane of condylus medialis femoris is(1.57±0.42)cm and at the ending point of great saphenous vein is(2.03±0.66)cm;the external diameter of the starting point

the tip of the femoral triangle and the ending point of femoral vein is(1.62±0.49)cm

(1.77±0.42)cm

(2.03 ± 0.66)cm respectively;the external diameter of the starting point

midpoint and ending point of popliteal vein is(1.55±0.51)cm

(1.59±0.37)cm

(1.62±0.49)cm respectively;most of venous valve is bivalve

and there is much more valve in the distal veins.Conclusion:Data of this study based on applied anatomy are provided systematic and detailed basis to those operations on the legs.