Histochemical properties of the biventer cervicis muscle of the chick: a relationship between multiple innervation and slow-tonic fibre types |
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Authors: | J P Toutant T Rouaud and G H Le Douarin |
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Institution: | (1) Laboratoire de Physiologie animale et cellulaire, Faculté des Sciences, 2 rue de la Houssimière, 44072 Nantes Cedex, France |
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Abstract: | Summary Chick biventer cervicis muscle fibres have been studied histochemically. Fast-twitch, focally innervated ( ) fibres represent 70–80% of the total fibres in this muscle. Two histochemical profiles of slow-tonic multi-innervated ( ) fibres have been observed from embryonic life to the adult (three-months) stage. These two slow-tonic types differ in the activity of their histochemically demonstrated myofibrillar ATPase after either acid or alkaline preincubation, and after formalin fixation. Both slow-tonic fibre types have a high oxidative metabolism and are PAS-negative. They are referred as to
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2R fibre types (slow-tonic oxidative) in an expansion of Ashmore's nomenclature, and compared to avian slow-tonic sub-types that have been described in recent reports.
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2 fibre types exhibit a similar pattern of innervation. Possible explanations of the origin of histochemical heterogeneity in multiple innervated fibres are discussed. |
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