[1](英语:sacrum)又称荐骨[2]荐椎,是一大型三角形,由5块骶椎在18至30岁融合而成。它是骨盆带的基部,位于骨盆腔的后上方,上承腰椎,下接尾椎,在2块髋骨之间。骶骨侧面上部有耳状面,与髂骨同名的耳状面构成骶髂关节

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