median sacral vein median sacral vein the median sacral vein (or middle sacral veins) is a vein of the abdomen. it accompanies the median sacral artery along the front of the sacrum. it ends in the left common iliac vein. sometimes, it ends in the angle of junction of the two common iliac veins. median sacral veinthe iliac veins.detailsarterymedian sacral arteryidentifierslatinvena sacralis medianata98a12.3.10.002ta25022fma77168anatomical terminology