<prompt> Poal vein begins at the level of which veebra?L2L4L5None of the above  <response>: The poal vein begins at the level of the second lumbar veebra and is formed from the convergence of the superior mesenteric and splenic veins. It is 8 cm long and lies anterior to the inferior vena cava and posterior to the neck of the pancreasRef: Grays anatomy 40th edition, Chapter 85. 