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尾骨（英语：coccyx，tailbone）又称尾椎，是三角形的小骨块，由3至5块退化的尾椎融合而成。其底部上接骶骨尖而形成关节，尖部朝下接肛尾韧带。尾椎无椎弓，无椎管。它是脊柱中最不发达的部分，代表尾巴的退化器官。
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脊柱 -
脊柱 -
Left Levator ani from within.
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Median sagittal section of male pelvis. -
Median sagittal section of female pelvis.
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