尾骨(英語:coccyx,tailbone)又稱尾椎,是三角形的小骨塊,由3至5塊退化的尾椎融合而成。其底部上接骶骨尖而形成關節,尖部朝下接肛尾韌帶。尾椎無椎弓,無椎管。它是脊柱中最不發達的部分,代表尾巴退化器官

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尾骨由五個椎骨組成

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