Jijin thyroid na ƙasa shine jigon jini a cikin wuyansa wanda ke fitar da jinin da aka cire daga glandar thyroid, glandan parathyroid, da sauran sassan da ke kusa. Kalmar "ƙananan" a cikin wannan mahallin tana nufin wurinta a ƙasa ko ƙarƙashin babban jijiya thyroid. Jijin thyroid na ƙasa yana gudana zuwa ƙasa tare da glandar thyroid kuma yawanci yana magudawa zuwa cikin jijiya brachiocephalic, babban jijiya a cikin ƙirji.