Cosmin

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Cosmin is a bone-like substance that is found in the skin of certain types of fish (meat / muscle fins = sarcopterygii ). It is an important component in the formation of the fish scale .

There are several types of fish scales: placoid scales , ganoid scales , cosmoid scales, and two basic forms of elasmoid scales (cycloid scales and ctenoid scales). Cosmin is mainly found in cosmoid scales.

Fish scales are constructed in a similar way to human teeth. Cosmin is a substance similar to dentin (tooth bone). Cosmin differs from dentin in that its canals branch out like trees (instead of individually) to the pulp cavity (tooth pulp ). These tubules are formed by extensions ( Tomes fibers ) of those cells that form the cosmin ( odontoblasts ).

literature

  • Kurt Fiedler: Textbook of Special Zoology. Volume II, Part 2: Fish. Gustav Fischer Verlag, Jena 1991, ISBN 3-334-00339-6 .
  • W. Westheide, R. Rieger: Special Zoology. Part 2: vertebrates or skulls. Spektrum Akademischer Verlag, Munich 2004, ISBN 3-8274-0307-3 .
  • EJ Hentschel, GH Wagner: Zoological dictionary. Gustav Fischer Verlag, Jena 1996, ISBN 3-334-60960-X .
  • Lothar Kampf , Rolf Kittel, Johannes Klapperstück: Guide to the anatomy of vertebrates. Gustav Fischer Verlag, Jena 1993, ISBN 3-334-60454-3 .