CONTRACTILE AND HISTOCHEMICAL PROPERTIES OF THE INFERIOR OBLIQUE MUSCLE IN THE RAT AND IN THE CAT

Mechanical and histochemical properties of inferior oblique muscles (IO) were compared in adult albino rat and pigmented cat. The twitch contraction times and the fusion frequencies were about the same in both species indicating similar contractile properties of the fast contracting fibers. Rat IO seemed to contain fewer slowly contracting fibers than cat IO; half‐decay time of the twitch was shorter in rat than in cat muscles and fusion started at higher stimulus frequencies. Fatigue resistance was lower in rat than in cat. Post‐tetanic potentiation occurred in the cat but not in the rat IO.

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