TY - JOUR
T1 - Volume changes in human masticatory muscles between jaw closing and opening
AU - Goto, T. K.
AU - Tokumori, K.
AU - Nakamura, Y.
AU - Yahagi, M.
AU - Yuasa, K.
AU - Okamura, K.
AU - Kanda, S.
PY - 2002/1/1
Y1 - 2002/1/1
N2 - 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.
AB - 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.
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U2 - 10.1177/154405910208100614
DO - 10.1177/154405910208100614
M3 - Article
C2 - 12097437
AN - SCOPUS:0035983429
SN - 0022-0345
VL - 81
SP - 428
EP - 432
JO - Journal of Dental Research
JF - Journal of Dental Research
IS - 6
ER -