The Deep Scleroblast of the Regenerating Teleost Scale: A Model of Cell Producing a Collagenic Plywood

  • Jean-Yves Sire
Part of the NATO ASI Series book series (NSSA, volume 93)


The teleost elasmoid scale is a collagenic tissue that is surrounded by a simple layer of cells, the scleroblasts, forming a bag in which the scale grows in surface and in thickness. A great number of thin (20 nm in diameter) randomly deposited fibrils constitutes the superficial thin layer (3 to 4 µm thick), the osseous layer, that quickly mineralizes. Large fibrils (65 nm in diameter) parallel to each other in the same layer, and each layer at angle with the other, form the fibrillary plate. This regular stack of fibrillary layers has been termed a “plywood-like” structure. In this plywood, mineralization progresses slowly, from the older superficial layers to the deep newer ones, with a distinct delay after the deposition of the organic matrix. The growth in thickness of this thick plywood (100 to 200 µm) is the result of the activity of the deep scleroblasts located at the basal surface of the scale.


Secretory Granule Rough Endoplasmic Reticulum Golgi Complex Thin Filament Granular Endoplasmic Reticulum 
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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Jean-Yves Sire
    • 1
  1. 1.E.R. “Formations Squelettiques”, Jeune Equipe C.N.R.S. Laboratoire d’Anatomie ComparéeUniversité Paris 7Paris Cedex 05France

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