Prevalence of the Third Head of the Lateral Pterygoid Muscle: A Magnetic Resonance Image Study

Prevalence of the Third Head of the Lateral Pterygoid Muscle: A Magnetic Resonance Image Study

Alternative title Prevalencia de la Tercera Cabeza del Músculo Pterigoideo Lateral: Estudio con Imágenes de Resonancia Magnética
Author Pompei Filho, Horacio Google Scholar
Guimaraes, Antonio Sergio Autor UNIFESP Google Scholar
Galdames, Ivan Claudio Suazo Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Ctr Posgrad CPO Sao Leopoldo Mandic
Univ Talca
Abstract The lateral pterygoid muscle (LPM) is important in the physiology and dysfunction of the temporomandibular joint (TMJ), which has described the presence of a third head in the lateral pterygoid muscle (THLPM). The purpose of this study was to evaluate the prevalence of THLPM and its relationship with the TMJ disc through magnetic resonance imaging (MRI). It was evaluated 178 MRI of the TMJ of healthy individuals, in images that presented THLPM, and these were defined and measured at the surface inserted into the disc. The prevalence of THLPM was 20.22% (n = 36). Insertion of THLPM was made entirely on the TMJ disc, the average area of insertion was 4.14mm (SD 1.35) in women and 4.67 (SD 2.68) in men, but these differences were not significant. We concluded that the LPM has a complex structure, and that a THLPM could contribute in the development of TMJ disc function alterations and anterior disc displacement.
Keywords Lateral pterygoid muscle
Temporomandibular joint
Articular disc
Temporomandibular dysfunction
Language English
Date 2009-12-01
Published in International Journal Of Morphology. Temuco: Soc Chilena Anatomia, v. 27, n. 4, p. 1043-1046, 2009.
ISSN 0717-9502 (Sherpa/Romeo, impact factor)
Publisher Soc Chilena Anatomia
Extent 1043-1046
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000279048100014
SciELO ID S0717-95022009000400014 (statistics in SciELO)

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