Why we get visible leg veins Varicose and spider veins are damaged veins. We develop them when tiny, one-way valves inside the veins weaken. In healthy veins, these valves push blood in one direction ...

Pinnate Venation: The veins extend from the midrib to the leaf margin. Oak and cherry tree leaves have pinnate venation. Palmate Venation: The veins radiate in a fan shape from the leaf petiole.

News and information on minimally invasive vascular disease therapies, covering peripheral vascular disease, aneurysms, stroke, hypertension, dialysis access, and venous issues.