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Evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process

OBJECTIVE: The lateral pterygoid is vital in coordinating multidimensional jaw movements. Since a vector in three‐dimensional (3D) space is defined by two 3D points, the role of the lateral pterygoid in 3D jaw movements is defined by its origin and insertion. Reportedly, the lateral pterygoid is ins...

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Autores principales: Sritara, Sasin, Tsutsumi, Masahiro, Fukino, Keiko, Matsumoto, Yoshiro, Ono, Takashi, Akita, Keiichi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8019758/
https://www.ncbi.nlm.nih.gov/pubmed/33205570
http://dx.doi.org/10.1002/cre2.353
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author Sritara, Sasin
Tsutsumi, Masahiro
Fukino, Keiko
Matsumoto, Yoshiro
Ono, Takashi
Akita, Keiichi
author_facet Sritara, Sasin
Tsutsumi, Masahiro
Fukino, Keiko
Matsumoto, Yoshiro
Ono, Takashi
Akita, Keiichi
author_sort Sritara, Sasin
collection PubMed
description OBJECTIVE: The lateral pterygoid is vital in coordinating multidimensional jaw movements. Since a vector in three‐dimensional (3D) space is defined by two 3D points, the role of the lateral pterygoid in 3D jaw movements is defined by its origin and insertion. Reportedly, the lateral pterygoid is inserted into not only the pterygoid fovea but also into the medial surface of the condylar process. The objective was to investigate the morphological features of the region of the lateral pterygoid that inserted into the medial surface of the condylar process. MATERIAL AND METHODS: Ten head halves of seven cadaveric donors were analyzed. In all specimens, the insertion area on the medial surface of the condylar process was measured based on microcomputed tomography images. Muscle fibers were separated into ≥50 small bundles, and positional relationships between the origins and insertions were investigated. RESULTS: Overall, 28.8 ± 5.0% of the insertion area of the lateral pterygoid was situated on the medial surface of the condylar process. Moreover, muscle fiber arrangement revealed that origins of the muscle bundles inserting into the medial surface in seven specimens posteriorly occupied the lateral plate of the pterygoid process longitudinally, whereas those in three specimens mainly occupied the posteroinferior portion. CONCLUSIONS: Muscle bundle inserting on the medial surface of the condylar process had a broad insertion area and a distinct origin on the posterior region of the lateral plate of the pterygoid process. This muscle bundle could act as one of the significant subunits within the lateral pterygoid. Therefore, anatomical coordination mechanisms underlying jaw movement cannot be elucidated without considering this subunit.
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spelling pubmed-80197582021-04-08 Evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process Sritara, Sasin Tsutsumi, Masahiro Fukino, Keiko Matsumoto, Yoshiro Ono, Takashi Akita, Keiichi Clin Exp Dent Res Original Articles OBJECTIVE: The lateral pterygoid is vital in coordinating multidimensional jaw movements. Since a vector in three‐dimensional (3D) space is defined by two 3D points, the role of the lateral pterygoid in 3D jaw movements is defined by its origin and insertion. Reportedly, the lateral pterygoid is inserted into not only the pterygoid fovea but also into the medial surface of the condylar process. The objective was to investigate the morphological features of the region of the lateral pterygoid that inserted into the medial surface of the condylar process. MATERIAL AND METHODS: Ten head halves of seven cadaveric donors were analyzed. In all specimens, the insertion area on the medial surface of the condylar process was measured based on microcomputed tomography images. Muscle fibers were separated into ≥50 small bundles, and positional relationships between the origins and insertions were investigated. RESULTS: Overall, 28.8 ± 5.0% of the insertion area of the lateral pterygoid was situated on the medial surface of the condylar process. Moreover, muscle fiber arrangement revealed that origins of the muscle bundles inserting into the medial surface in seven specimens posteriorly occupied the lateral plate of the pterygoid process longitudinally, whereas those in three specimens mainly occupied the posteroinferior portion. CONCLUSIONS: Muscle bundle inserting on the medial surface of the condylar process had a broad insertion area and a distinct origin on the posterior region of the lateral plate of the pterygoid process. This muscle bundle could act as one of the significant subunits within the lateral pterygoid. Therefore, anatomical coordination mechanisms underlying jaw movement cannot be elucidated without considering this subunit. John Wiley and Sons Inc. 2020-11-17 /pmc/articles/PMC8019758/ /pubmed/33205570 http://dx.doi.org/10.1002/cre2.353 Text en © 2020 The Authors. Clinical and Experimental Dental Research published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Sritara, Sasin
Tsutsumi, Masahiro
Fukino, Keiko
Matsumoto, Yoshiro
Ono, Takashi
Akita, Keiichi
Evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process
title Evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process
title_full Evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process
title_fullStr Evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process
title_full_unstemmed Evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process
title_short Evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process
title_sort evaluating the morphological features of the lateral pterygoid insertion into the medial surface of the condylar process
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8019758/
https://www.ncbi.nlm.nih.gov/pubmed/33205570
http://dx.doi.org/10.1002/cre2.353
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