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The articular bone is part of the lower jaw of most tetrapods, including amphibians, sauropsids (“reptiles”), birds and early synapsids. In these animals it is connected to two other lower jaw bones, the suprangular and the angular. It forms the jaw joint by articulating with the quadrate bone of the skull.
In mammals, the articular bone has migrated to the middle ear to become the malleus, while the quadrate bone becomes the incus. Paleontologists regard this modification as the defining characteristic of mammalian fossils.

 

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