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Journal of Dental Research
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CRITICAL REVIEWS IN ORAL BIOLOGY & MEDICINE

Fiber-type Composition of the Human Jaw Muscles—(Part 1) Origin and Functional Significance of Fiber-type Diversity

J.A.M Korfage, J.H. Koolstra, G.E.J. Langenbach and T.M.G.J. van Eijden*

Department of Functional Anatomy, Academic Center for Dentistry Amsterdam, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands;

Correspondence: * corresponding author, t.m.vaneijden{at}amc.uva.nl

This is the first of two articles on the fiber-type composition of the human jaw muscles. The present article discusses the origin of fiber-type composition and its consequences. This discussion is presented in the context of the requirements for functional performance and adaptation that are imposed upon the jaw muscles. The human masticatory system must perform a much larger variety of motor tasks than the average limb or trunk motor system. An important advantage of fiber-type diversity, as observed in the jaw muscles, is that it optimizes the required function while minimizing energy use. The capacity for adaptation is reflected by the large variability in fiber-type composition among muscle groups, individual muscles, and muscle regions. Adaptive changes are related, for example, to the amount of daily activation and/or stretch of fibers. Generally, the number of slow, fatigue-resistant fibers is relatively large in muscles and muscle regions that are subjected to considerable activity and/or stretch.

Key Words: jaw muscles • fiber type • myosin heavy-chain

Journal of Dental Research, Vol. 84, No. 9, 774-783 (2005)
DOI: 10.1177/154405910508400901
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