Vein, lymphatic direction： 

A、lymphedema 

B、Chronic venous insufficiency and varicose veins 

C、Ulcer 

Arterial ischemia direction： 

A、Intermittent claudication 

B、Diabetic foot 

C、Peripheral neuritis

Venous return 

Under normal circumstances, lower limb venous reflux relies on the contractile force generated by cardiac pulsation, the pumping effect generated by the muscles surrounding the deep vein within the deep fascia, and the synergistic effect of negative pressure suction in the chest during respiratory movements. Meanwhile, normal blood reflux also relies on the unidirectional restriction of venous valves.