哺乳动物听小骨进化
（重定向自哺乳類聽小骨演化）
哺乳动物的听小骨进化过程被认为是生物进化过程中最完备[1] 也是最重要的事件之一。这个进化事件的过程展现了大量的演变过程，并成为预适应和已有结构再作用的最佳范例。
在爬行动物中, 耳鼓与内耳是通过一根骨头（鼻小柱）连接在一起的，爬行动物上下颚之间的多块骨头在哺乳动物中没有发现。在哺乳动物进化的过程中，其中一块上颚骨（方块骨）和一块下颚骨（关节骨）失去了功用，但是被中耳借用来与鐙骨连接，形成了一串三个用来放大声音的听小骨。在哺乳动物中，这三块骨头叫做锤骨、砧骨和鐙骨。
参考资料
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扩展阅读
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