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Histochemical Analysis and Electromyographic Properties of Masticatory Muscles of the Guinea Pig Cavia Porcellus

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

The distribution of muscle fiber types and their electrical properties in subdivisions of the masticatory muscles in guinea pigs were individually investigated. Myosin ATPase, phosphorylase, and succinic dehydrogenase, were used to determine the types of muscle fiber. All the masticatory muscles consist of three fiber types (FOG, FG, and SO). However, the ratios of muscle fiber types in each masticatory muscle and in the subdivisions of the same muscle differ. Differences in the duration and the onset of electromyographic activity were determined for the same subdivisions of these muscles analyzed histochemically. The predominant active muscles are found always on one side during the entire cycle. It was found that in the case of the masseter the ipsilateral opening (working) muscles fire first, followed by the firing of the ipsilateral closing (balancing) muscles. In working muscle, the duration is longer and the level of electric activity is higher than in those of the balancing side. Both symmetric and asymmetric activities were found in deep masseters. The study reveals that in guinea pigs, the distribution of muscle fibers and their activity pattern vary among subdivisions of m. masseter, m. digastricus, and m. temporalis. The differences in regional muscular activity reflect differences in the fiber composition.

Affiliations: 1: (University of Illinois Medical Center, Chicago, Illinois 60660 and Department of Biological Sciences, Kent State University Kent, Ohio 44242


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