Muscle Fiber Type Composition, Fiber Diameter, Capillary Density in Temporalis and Masseter Muscles and Correlation with Bite Force

Muscle Fiber Type Composition, Fiber Diameter, Capillary Density in Temporalis and Masseter Muscles and Correlation with Bite Force

Alternative title Tipos de Fibras Musculares, Diámetro de Fibras y Densidad Capilar en los Músculos Masetero y Temporal y su Correlación con la Fuerza de Mordida
Author Guimaraes, Thatiana Bastos Autor UNIFESP Google Scholar
Ferreira, Mariana Brandao Google Scholar
Wakamatsu, Alda Google Scholar
Oliveira, Stanley Reis de Autor UNIFESP Google Scholar
Guimaraes, Antonio Sergio Autor UNIFESP Google Scholar
Galdames, Ivan Claudio Suazo Autor UNIFESP Google Scholar
Marie, Suely Kazue Nagahashi Autor UNIFESP Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Univ Autonoma Chile
Abstract The jaw muscles are essential components in the stomatognatic system. Their complex architecture allows them to execute several motor tasks. One of the structural peculiarities is the presence of hybrid and neonatal fibers. We studied the differences of the fiber-type in masseter and temporalis muscles along the first to nineth decades in both genders. Seventy-four (74) samples were analyzed by immunohistochemistry. Slow and fast muscle fibers distribution was similar in both muscles in both genders. Hybrid fiber was observed in all decades, and its frequency decreased significantly (p<0.001) with aging in masseter. Neonatal myosin expression was observed in all decades, its expression was more frequent in masseter (p=0.01), and males in temporalis (p=0.025). Decrease of the cross sectional area of fast and slow fibers, and decrease of capillary density were detected with aging. These morpho-immunohistochemical alterations on masseter and temporalis muscles correlated to the decrease in bite force with aging.
Keywords Masseter
temporalis
Muscle fiber type
Capillary density
Bite force
Language English
Date 2013-06-01
Published in International Journal Of Morphology. Temuco: Soc Chilena Anatomia, v. 31, n. 2, p. 747-753, 2013.
ISSN 0717-9502 (Sherpa/Romeo, impact factor)
Publisher Soc Chilena Anatomia
Extent 747-753
Origin http://dx.doi.org/10.4067/S0717-95022013000200064
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000327763000064
SciELO ID S0717-95022013000200064 (statistics in SciELO)
URI http://repositorio.unifesp.br/11600/44085

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