Summary
The anterior latissimus dorsi muscle of the chick is largely composed of slow-tonic fibres but contains a few fast fibres defined by their acid-labile, alkali-stable myofibrillar ATPase activity. These fibres are referred to as α fibres. Differing from the slow-tonic (α′ and β′) fibres which are multiply innervated withen grape endings, the α (fast) fibres are innervated by typicalen plaque endings. The innervation of thirty-two α fibres were studied closely and it was concluded that about a half of the α fibres were focally innervated whereas a half were innervated in two distinct loci byen plaque endings. In only one case, a fast fibre with three widely spaceden plaque endings was observed. The mean intersynaptic length was significantly larger on α fibres than on α′ and β′ fibres. No variation in the histochemical properties of myofibrillar ATPase was observed either along the entire length of singly and dually innervated α fibres, or along α′ and β′ fibres. It is concluded that the three extrafusal fibre types of the anterior latissimus dorsi muscle maintain uniform histochemical characteristics along their length in spite of a possible innervation by several motoneurons.
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Rouaud, T., Toutant, JP. Histochemical properties and innervation pattern of fast and slow-tonic fibre types of the anterior latissimus dorsi muscle of the chick. Histochem J 14, 415–428 (1982). https://doi.org/10.1007/BF01011854
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DOI: https://doi.org/10.1007/BF01011854