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Meckelian cartilage
also called "Meckel's Cartilage"

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  1. is a piece of cartilage ("gristle") from which the mandibles (lower jaws) of vertebrates evolved

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 20, 2009
  2. Originally it was the lower of two cartilages which supported the first gill arch (nearest the front) in early fish

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 20, 2009
  3. Then it grew longer and stronger, and acquired muscles capable of closing the developing jaw

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 20, 2009
  4. In early fish and in chondrichthyans (cartilaginous fish such as sharks, which are not primitive in any sense of the word), the Meckelian Cartilage continued to be the main component of the lower jaw

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 20, 2009
  5. But in the adult forms of osteichthyans (bony fish) and their descendants (amphibians, reptiles, birds, mammals), the cartilage was covered in bone - although in their embryos the jaw initially develops as the Meckelian Cartilage

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 20, 2009
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