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Journal of Dental Research
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Fiber-type Composition of the Human Jaw Muscles—(Part 2) Role of Hybrid Fibers and Factors Responsible for Inter-individual Variation

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


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  		Figure 1. Distribution of pure and hybrid fiber types (mean ± SD) in the human jaw-closers (temporalis, masseter, pterygoids) and jaw-openers (mylohyoid, digastric, geniohyoid); SD values are a measure for inter-individual variability. Muscle samples (jaw-closers, 6 to 9 per muscle; jaw openers, 2 to 4 per muscle) were obtained from eight cadavers. Because the fiber-type distribution of the lateral pterygoid had more similarities with that of the jaw-closers than with that of the jaw-openers, this muscle was included among the group of jaw-closers. For more information, see Korfage et al.(2001). MyHC = myosin heavy-chain.

 

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  		Figure 2. Electrophoretic (A) and immunohistochemical (B) characterization of single human jaw-muscle fibers obtained from the digastric and temporalis. Consecutive fibers (1–5) were immunolabeled with antibodies against MyHC-IIA+IIX, MyHC-IIA, and MyHC-I. MyHC composition of fragments of the same fibers was determined by gel electrophoresis. Fiber types are: pure type I (1), pure type IIA (4), pure type IIX (5), and hybrid type IIA+IIX (2 and 3). In a total 218 fibers, 118 were classified as pure and 100 as hybrid fibers. In the hybrid fibers, all combinations of isoforms were found; the proportions of these isoforms varied greatly (for more details, see Korfage and Van Eijden, 2003b).

 

Journal of Dental Research, Vol. 84, No. 9, 784-793 (2005)
DOI: 10.1177/154405910508400902
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