RT Book, Section A1 Weiss, Robert A. A1 Weiss, Margaret A. A1 Beasley, Karen L. SR Print(0) ID 1175620067 T1 Venous Physiology and Pathology T2 Sclerotherapy and Vein Treatment, 2e YR 2012 FD 2012 PB McGraw Hill LLC PP New York, NY SN 9780071485425 LK dermatology.mhmedical.com/content.aspx?aid=1175620067 RD 2024/04/25 AB In order to treat venous problems properly, it is essential to understand the normal pattern of venous blood flow and the effects of venous valves. For practical purposes, the venous system of the leg can be considered to have two major parts, a deep component and a superficial component. The superficial veins serve as a primary collecting system and are connected through perforating veins into the deep veins, which normally carry about 90 percent of the blood from the leg back to the central circulation.