The ventral abdominal vein is a large vein 1-2 mm within the coelomic cavity on ventral midline between the umbilical scar and pelvic inlet. Care is advised since the coelomic cavity has a large capacity if there is continued bleeding after venipuncture. | The ventral abdominal vein is a large vein 1-2 mm within the coelomic cavity on ventral midline between the umbilical scar and pelvic inlet. Care is advised since the coelomic cavity has a large capacity if there is continued bleeding after venipuncture. |