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