Abstract
The masseter muscles of the Japanese field vole Microtus montebelli were studied histochemically and electron microscopically. The masseter muscles were composed of only fast-twitch oxidative (FO) fibers. As to ultrastructural features of the fibers, mitochondria, sarcoplasmic reticula and transverse tubules were well developed. It is concluded that the masseter muscles in M. montebelli have the structural characteristics that they can contract fast and enduringly. Thus, they appear to be highly adapted to herbivorous food habit.
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