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Reptile-to-Mammal Jaw Joint and Middle Ear Transition

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How the ancestral reptilian jaw joint bones were repurposed into the mammalian middle-ear ossicle chain.

by @openstemUpdated Biology
Ancestral reptile: articular-quadrate jaw joint, single ear ossicle stapesNew dentary-squamosal jaw joint evolvesArticular and quadrate released from jaw functionArticular becomes malleusQuadrate becomes incusThree-ossicle middle ear chain: malleus, incus, stapes

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