Zygapophysis

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A zygapophysis is a process which sticks out of an end of a vertebra to lock with a zygapophysis on the next vertebra, to make the backbone more stable. Each typical vertebra has 4 of them: two front (prezygapophysis) and two back (postzygapophysis), two left and two right. Its plural is "zygapophyses". Its origin is Greek ζυγον = "yoke" (because it links two vertebrae) + απο = "away" + φυσις = "process".

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