The venous drainage of the back can be divided into three outflow territories corresponding to the three major inflow territories of its arterial supply. Blood from the nuchal and shoulder regions drains into the right and left innominate veins (V. brachiocephalica). The thoracolumbar area is drained by the azygos vein and the lumbosacral area by the iliac veins. Longitudinal and transverse connexions between these territories are even more abundant on the venous side than on the arterial. Taken as a whole, they form a broad pathway between the superior and inferior venae cavae (Fig. 118).
KeywordsExternal Jugular Vein Azygos Vein Common Iliac Vein Lumbar Vein Vertebral Vein
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