DIAMETER CHANGES OF MUSCLE-FIBER TYPES IN INFERIOR OBLIQUE MUSCLE OF RABBIT FOLLOWING DENERVATION

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  • 1 January 1976
    • journal article
    • research article
    • Vol. 96  (3) , 386-403
Abstract
The whole inferior oblique muscle hypertrophied, while some of the muscle fibers hypertrophied and others showed atrophy, depending on the fiber type. Fiber types were determined by their histochemical enzyme profile. In the central layer of the muscle the phasic muscle fibers, which were rich in mitochondria, exhibited a transient hypertrophy being maximal 4-5 wk after denervation and afterwards they atrophied; other phasic muscle fibers, which were poor in mitochondria, atrophied without any sign of hypertrophy. Special, putatively slow tonic muscle fibers, which have low enzyme activities, underwent small long-lasting increases of their diameters. In the superficial layer of extraocular muscle there were 2 types of extremely thin muscle fibers rich in mitochondria. Both these fiber types hypertrophied to the greatest degree and for a very long time. Comparable changes in fiber diameters were reported from special muscle fibers in other vertebrate muscles; similarities and differences were discussed.

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