Applied Anatomy of Lumbar Vein, Ascending Lumbar Vein and Azygos Vein

Objective To investigate the relationship between intravenous hypertension myelopathy syndrome and the abnormality of the spinal veins. Methods The study was performed in 30 adults cadavers. The distributions, origins and valves of the lumbar veins, ascending lumbar veins and azygos veins were observed. The diameters of the above-mentioned veins were measured. Results The lumbar veins, where no valves were observed, were variable. Azygos vein originated from the right ascending lumbar vein and was drained into superior vena cava. Hemiazygos vein originated from left ascending lumbar vein, and collected the blood of left posterior intercostal veins and accessory hemiazygos vein. The lower segment of azygos vein and hemiazygos vein were drained into vena iliac communis and inferior vena cava. Conclusions The lumbar vein, ascending lumbar vein and azygos vein drain the venous blood of the thoracolumbar segment of the spinal cord. The narrow of them can produce the spinal veins congestion and the intravenous hyperten-sion in the vertebral tube.