AI Article Synopsis
- Most jaw muscles are complex and have different structures, which relate to their specific functions in chewing.
- A study was conducted using MRI on ten young adults to observe changes in the volume of masticatory muscles during jaw opening and closing.
- Results showed minimal volume changes in the masseter and medial pterygoid muscles, while the lateral pterygoid muscle significantly decreased in volume when opening the jaw, indicating variability in how these muscles respond during movement.
Article Abstract
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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| http://dx.doi.org/10.1177/154405910208100614 | DOI Listing |
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