<prompt> Superior pa of IVC develops from which pa?Right vitelline veinSubcardinal veinAnterior cardinal veinSacrocardinal vein  <response>: Anterior cardinal vein and subcardinal vein will be degenerated during development where as sacrocardinal segment forms the inferior pa. Reference: TEXTBOOK OF CLINICAL EMBRYOLOGY... VISHRAM SINGH SECOND EDITION...PAGE NO:245 