This model shows a medium-sized artery with two adjacent veins from the antebrachial area with adjoining fat tissue and muscle enlarged 14 times. This models illustrates the reciprocal anatomical relationship of artery and vein and the basic functional techniques of the venous valves. The right vein is opened throughout in the anterior segment, revealing the orifice of a feeder vein and two venous valves, i.e. “flap valves” formed by the duplication of the Tunica Intima. The left vein and the middle artery are fenestrated in the upper anterior segment, revealing the various layers of the wall structure in a cross an d longitudinal section and in top view. The rear of the model shows the relief of two veins which illustrates the functional aspect of the venous valves.