A venous valve is bicuspid (getting two leaflets) which is formed by an infolding of part of the tunica intima on either side of your lumen of your veins. The leaflets are strengthened with collagen, and elastic fibres, and lined with endothelium.[ten] The endothelial cells about the surfaces of your http://sgvascularctr.com/understanding-venous-leak-treatment-in-singapore/