Three-dimensional lateral pterygoid muscle volume: MRI analyses with insertion patterns correlation

We evaluated lateral pterygoid muscle volume in closed and open mouth positions in association with anterior disc displacement, effusion and abnormal articular disc shape from three-dimensional reformations of MRI. A total of 24 MRI of a sample (15 females, 9 males) aged 19–64 years (37.2 years±11.4...

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Bibliographic Details
Published in:Annals of anatomy 2016-11, Vol.208, p.9-18
Main Authors: Melke, Gabriela Sobral de Figueiredo, Costa, André Luiz Ferreira, Lopes, Sérgio Lúcio Pereira de Castro, Fuziy, Acacio, Ferreira-Santos, Rívea Inês
Format: Article
Language:English
Subjects:
Adult
Aging - pathology
Female
Humans
Imaging, Three-Dimensional - methods
Magnetic Resonance Imaging - methods
Male
Mandible - anatomy & histology
Middle Aged
MRI, Diagnostic imaging
Muscle, Skeletal
Organ Size
Pterygoid Muscles - anatomy & histology
Reproducibility of Results
Sensitivity and Specificity
Sex Factors
Temporomandibular joint
Temporomandibular Joint - anatomy & histology
Tendons - anatomy & histology
Young Adult
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Summary:We evaluated lateral pterygoid muscle volume in closed and open mouth positions in association with anterior disc displacement, effusion and abnormal articular disc shape from three-dimensional reformations of MRI. A total of 24 MRI of a sample (15 females, 9 males) aged 19–64 years (37.2 years±11.4) were assessed. Segmentation and volumetric assessment of the total, upper and lower heads of the lateral pterygoid muscle were performed using free software. The upper head of the lateral pterygoid muscle had a smaller volume than the lower head at both sides, in the closed- and open-mouth positions. In the open-mouth position, individuals with a subdivided upper head, where one component was inserted in the articular disc and another in the mandibular head, displayed a significantly larger volume of the upper head compared to individuals who had a single attachment to the articular disc (p=0.0130). The lateral pterygoid muscle has different volumes in the closed- and open-mouth positions. Gender affected muscle volume, specifically the upper head component. Insertion type in the upper head also seemed to affect muscle volume.
ISSN:0940-9602
1618-0402
DOI:10.1016/j.aanat.2016.05.007