Summary
The muscular layer of the fish oesophagus is made up exclusively of striated muscles, which form a circular and a longitudinal layer. The intestinal muscular layer of the tench, which is an exception among the vertebrates in this respect, consists of two layers of striated muscles and a layer of smooth ones. The organization of striated muscle fibres is described from the muscular layer of the alimentary canal in four species: the tench, crucian carp, gudgeon and stone-loach. The fibres of the oesophagus differ from each other in diameter, length of sarcomeres, glycogen content and, in the case of one species, organization of SR. On the basis of the organization of sarcomeres all the fibres examined must be counted among the slow-contracting ones (broad Z line). The sarcoplasmic reticulum is organized according to the Z type except for the fibres of the oesophageal muscles in which the SR represents the A-I type. Two types, “en grappe” and “en plaque”, of nerve endings have been observed. The presence of relatively large dense core vesicles seems to indicate their adrenergic origin.
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This work has been supported by the Polish Academy Sciences.
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Kilarski, W., Bigaj, J. The fine structure of striated muscle fibres of tunica muscularis of the intestine in some teleosts. Z. Zellforsch. 113, 472–489 (1971). https://doi.org/10.1007/BF00325667
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DOI: https://doi.org/10.1007/BF00325667