Cov iav Spur yog cov iav uas pheej yig uas siv ntau xwb. Lawv yog cov yam ntxwv los ntawm cov hniav uas yog perpendicular rau ntawm lub ntsej muag ntawm cov iav. Cov iav Spur yog cov uas muaj ntau tshaj plaws, thiab feem ntau yog pheej yig tshaj plaws. Cov qauv piav qhia yooj yim rau cov iav spur tau qhia hauv daim duab hauv qab no.