A venous valve is bicuspid (acquiring two leaflets) and is also formed by an infolding of Element of the tunica intima on both aspect of the lumen with the veins. The leaflets are strengthened with collagen, and elastic fibres, and coated with endothelium.[10] The endothelial cells to the surfaces from http://sgvascularctr.com/understanding-venous-leak-treatment-in-singapore/