Region Dependent Distribution of Muscle Fibre Types and Muscle Spindles in the Human Masseter Muscle Studied in Cross-Sections of Whole Muscle
Human masseter is divided anatomical into superficial and deep parts, but regional specialisation in the distribution of fibre types and muscle spindles is organised differently. Thus, the anterior part is predominantly composed of type I fibres whereas type II fibres are concentrated in the posterior part. Spindles are most numerous and complex in the deep portion (Eriksson & Thornell, 1983; 1987). Previous studies concentrated on antero-posterior differences and were based on samples from restricted muscle regions. Since they may have missed medio-lateral variations the present study has been carried out on whole muscle transverse sections using enzyme- and immunohistochemical methods.
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