An important support for understanding the difference between artery and vein histology. 

In this single-piece model one artery and two veins are represented in great detail.

 One vein is longitudinally sectioned to show the closed and open venous valves; 

the artery and the right vein are cross-sectioned so the different layers, such as tunica media, 

elastic membrane and tunica adventitia, can be easily recongnized.