Kalmar "jijiya azygous" tana nufin takamaiman tsarin halittar jiki da ake samu a jikin mutum. Babban jijiya ce da ke gudana a tsaye a gefen dama na kogon thoracic (kirji). Jijin azygous ne ke da alhakin zubar da jinin da aka cire daga bayan bangon kirji, da kuma bangon thoracic da na ciki. Yana da muhimmin sashi na tsarin venous kuma yana taka rawa wajen mayar da jini zuwa zuciya don iskar oxygen.