TY - CHAP M1 - Book, Section TI - Venous Physiology and Pathology A1 - Weiss, Robert A. A1 - Weiss, Margaret A. A1 - Beasley, Karen L. Y1 - 2012 N1 - T2 - Sclerotherapy and Vein Treatment, 2e 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. SN - PB - McGraw Hill LLC CY - New York, NY Y2 - 2024/03/28 UR - dermatology.mhmedical.com/content.aspx?aid=1175620067 ER -