HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (5) Citing Articles via Google Scholar Google Scholar Articles by Goto, T.K. Articles by Kanda, S. Search for Related Content PubMed PubMed Citation Articles by Goto, T.K. Articles by Kanda, S.

Volume Changes in Human Masticatory Muscles between Jaw Closing and Opening

¹ Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan;
² Department of Radiology, Kyushu University Hospital, Fukuoka, Japan; and
³ Asahi Kasei Joho System Co., Ltd., Tokyo, Japan;

*corresponding author, goto{at}rad.dent.kyushu-u.ac.jp

Most jaw muscles are complex, multipennate with multiple components. The morphologic heterogeneity of masticatory muscles reflects their functions. We hypothesized that the volume of masticatory muscles changes between jaw closing and opening, and that there is a difference in the volume change among the muscles. Magnetic resonance images of the entire head were obtained in ten normal young adult subjects before and after maximum jaw opening. The volume changes of the masseter, medial, and lateral pterygoid muscles were measured. Only slight changes were seen in the masseter and medial pterygoid muscles. The lateral pterygoid muscle, however, significantly decreased its volume during jaw opening. The results provide normative values of muscle volume in living subjects, and suggest that the volume changes differ among jaw muscles.

KEY WORDS: human masticatory muscles • muscle volume • magnetic resonance imaging • jaw opening

This article has been cited by other articles:

				T.K. Goto, S. Nishida, M. Yahagi, G.E.J. Langenbach, Y. Nakamura, K. Tokumori, S. Sakai, H. Yabuuchi, and K. Yoshiura Size and orientation of masticatory muscles in patients with mandibular laterognathism. J. Dent. Res., June 1, 2006; 85(6): 552 - 556. [Abstract] [Full Text] [PDF]

				T.K. Goto, M. Yahagi, Y. Nakamura, K. Tokumori, G.E.J. Langenbach, and K. Yoshiura In vivo Cross-sectional Area of Human Jaw Muscles Varies with Section Location and Jaw Position J. Dent. Res., June 1, 2005; 84(6): 570 - 575. [Abstract] [Full Text] [PDF]