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