A venous valve is bicuspid (acquiring two leaflets) which is fashioned by an infolding of A part of the tunica intima on possibly aspect from the lumen with the veins. The leaflets are strengthened with collagen, and elastic fibres, and included with endothelium.[ten] The endothelial cells on the surfaces from http://sgvascularctr.com/understanding-venous-leak-treatment-in-singapore/