Summary
Changes of muscle weights, fiber diameters and ultrastructure were studied in the slow anterior latissimus dorsi (ALD) and in the fast posterior latissimus dorsi (PLD) of the chick three weeks after denervation and tenotomy, and after combined denervation and tenotomy of the two muscles.
The slow ALD muscle becomes hypertrophic after denervation (Feng, Jung and Wu, 1962). Three weeks after nerve section, wet weights of ALD muscles are increased by 60% and fiber diameters become by 30% larger than those of contralateral control muscles. In spite of this hypertrophy, degenerative changes are seen in the ultrastructure, similar to those described in denervated atrophic muscles. Areas of dedifferentiation with autophagic vacuoles and aggregates of tubules are found in superficial layers of some fibers. Disintegration of Z lines and filaments along one or two sarcomeres occurs in a number of myofibrils, especially in muscles of young animals.
In contrast to denervation alone, simultaneous denervation and tenotomy of the ALD muscles results in atrophy. Decrease of muscle weights and reduction of fiber diameters are similar as after tenotomy; in both cases muscle fibers waste by degeneration and atrophy of myofibrils.
The fast PLD muscles underwent extensive atrophy in all three series of experiments. Corresponding atrophic and degenerative changes of ultrastructure were found in all instances.
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The authors wish to acknowledge gratefully the skillful technical assistance of Mrs. M. Sobotková and Ing. M. Doubek, and editorial assistance of Miss Virginia Hamilton.
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Jirmanová, I., Zelená, J. Effect of denervation and tenotomy on slow and fast muscles of the chicken. Z. Zellforsch. 106, 333–347 (1970). https://doi.org/10.1007/BF00335777
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DOI: https://doi.org/10.1007/BF00335777