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.
KeywordsMotor Unit Fibre Type Muscle Spindle Masseter Muscle Deep Portion
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Eriksson, P.-O. & Thornell, L.-E. (1983) Histochemical and morphological muscle-fibre characteristics of the human masseter, the medial pterygoid and the temporal muscles. Arch. Oral Biol.
, 781–795.PubMedCrossRefGoogle Scholar
Eriksson, P.-O. & Thornell, L.-E. (1987) Relation to extrafusal fibre-type composition in muscle-spindle structure and location in the human masseter muscle. Arch. Oral Biol.
, 483–491.PubMedCrossRefGoogle Scholar
Eriksson, P.-O., Stålberg, E. & Antoni, L. (1984) Flexibility in motor-unit firing pattern in human temporal and masseter muscles related to type of activation and location. Arch. Oral Biol.
, 707–712.PubMedCrossRefGoogle Scholar
McMillan, A. S. & Hannam, A. G. (1992) Task-related behaviour of motor units in different regions of the human masseter muscle. Arch. Oral Biol.
, 849–857.PubMedCrossRefGoogle Scholar
Stålberg, E. & Eriksson, P.-O. (1987) A scanning electromyographic study of the topography of human masseter single motor units. Arch. Oral Biol.
, 793–797.PubMedCrossRefGoogle Scholar
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