WASHINGTON, DC - JANUARY 20: U.S. President Donald Trump delivers his inaugural address on the West Front of the U.S. Capitol on January 20, 2017 in Washington, DC. In today's inauguration ceremony Donald J. Trump becomes the 45th president of the United States.
One-Way Valves in the Veins. One-way valves consist of two flaps (cusps or leaflets) with edges that meet. These valves help veins return blood to the heart. As blood moves toward the heart, it pushes the cusps open like a pair of one-way swinging doors (shown on the left).
Eger & Wagner (1949) by dissection of 200 limbs (100 cadavers) found that 69% of the 200 limbs studied had valves present within the common femoral vein proximal to the saphenofemoral junction, that is within 9 cm proximal to the junction of the FV and DFV. There was complete absence of valves within this region in 31%.