Mixing
人字骨
梁龍屬的人字骨
梁龍的椎骨，其中有像雙梁一様的人字骨，這也是梁龍名稱的由來，位在伦敦的自然史博物馆
人字骨（chevron）是位在尾巴腹側一系列骨骼中的骨骼，像許多包括恐龙在內的許多爬行动物、一些哺乳动物（例如袋鼠及海牛屬）都有這類骨骼。
人字骨的主要功能是保護尾巴內的一些关键組織，例如神经及血管，避免因為負擔尾巴的重量而受損。
參考資料
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Information security
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