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. 1982 Nov 30;58(22):1478-84.

[Ultrastructural findings on collagen fibers of tendon sheaths from the rat tail]

[Article in Italian]
L Leonardi, R Strocchi, P P Castellani, S Guizzardi, V Ottani
  • PMID: 7165757

[Ultrastructural findings on collagen fibers of tendon sheaths from the rat tail]

[Article in Italian]
L Leonardi et al. Boll Soc Ital Biol Sper. .

Abstract

Rat tail tendon sheaths have been studied by electron microscopy and freeze-etching techniques. Pictures from thin sections have shown the presence of three different sheaths: a) a sheath commun to all tendons, (paratenon) formed by collagen fibrils differently orientated with a variable diameter (20nm 200nm) b) a specific sheath for every tendon, (peritenoneum) which is composed by different layers: the external ones present collagen fibrils of wide and variable diameter (20nm-200nm). The internal ones present collagen fibrils of uniform and small diameter (50nm-60nm). Between these fibres layers, there is evidence for the presence of fibrocits forming continuous cellular layers. c) a sheath surrounding tendon fascicles, (endotenoneum) formed by small and uniform collagen fibrils and a continuous cellular layers. Replicas of freeze-fractured collagen fibrils having a variable diameter show a straight arrangement of their microfibrils.

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