哺乳動物聽小骨進化
哺乳動物的聽小骨進化過程被認為是生物進化過程中最完備[1] 也是最重要的事件之一。這個進化事件的過程展現了大量的演變過程，並成為預適應和已有結構再作用的最佳範例。
在爬行動物中, 耳鼓與內耳是通過一根骨頭（鼻小柱）連接在一起的，爬行動物上下顎之間的多塊骨頭在哺乳動物中沒有發現。在哺乳動物進化的過程中，其中一塊上顎骨（方塊骨）和一塊下顎骨（關節骨）失去了功用，但是被中耳借用來與鐙骨連接，形成了一串三個用來放大聲音的聽小骨。在哺乳動物中，這三塊骨頭叫做錘骨、砧骨和鐙骨。
參考資料
- ^ Allin EF. Evolution of the mammalian middle ear. J. Morphol. December 1975, 147 (4): 403–437. PMID 1202224. doi:10.1002/jmor.1051470404.
擴展閱讀
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