<prompt> In couinauds classification, segment IV of liver isCaudate lobeQuadrate lobeRight lobeLeft lobe  <response>: Segments nomenclature I Caudate lobe sometimes subdivided into left and right pas called segment IX II Left lateral superior segment III left lateral Inferior segment IV left medial segment or Quadrate lobe V Right anterior Inferior segment VI Right posterior Inferior segment VII Right posterior superior segment VIII Right anterior superior segment 