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Journal of Dental Research, Vol. 82, No. 2,
106-111 (2003)
DOI: 10.1177/154405910308200206
Functional Heterogeneity in the Superior Head of the Human Lateral Pterygoid
I. Phanachet1,
T. Whittle,
K. Wanigaratne,
I.J. Klineberg,
B.J. Sessle2 and
G.M. Murray3
Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, Level 3, Professorial Unit, Westmead Centre for Oral Health, Westmead Hospital, Westmead, NSW 2145, Australia;
1 Faculty of Dentistry, Chiang Mai University, Suthep Rd., Muang, Chiang Mai, 50100 Thailand, and Faculty of Dentistry, University of Sydney;
2 Faculty of Dentistry, University of Toronto, 124 Edward Street, Toronto, ON M5G 1G6, Canada;
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Figure 1. An example of single motor unit activity from the medial part of the right SHLP during jaw tasks. Data are shown from subject B (see Table) during contralateral movement (A), protrusion (B), and submaximal jaw opening and jaw closing (C). Traces at the top of each figure represent mid-incisor point displacement in x- (anterior-posterior, + posterior), y- (mediolateral, + to right), and z- (superior-inferior, + superiorly) axes. Spike-train pulses are at the bottom of each figure. Each short vertical line is a spike-train pulse that indicates the time of occurrence of a SMU action potential. All movements started and ended at resting postural jaw position. Units 1, 2, 3, 4, and 5 refer to the same units in each of the recordings. The computer tomography imaging in the horizontal plane (top in D) and the reformated image taken through the fine-wire tips in the frontal plane (bottom in D) show the electrode fine-wire tips (black arrows).
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Figure 2. An example of SMU activity from the middle part of the right SHLP during jaw tasks. Data are shown from subject H (Table) during ipsilateral (A) and contralateral movements (B), retrusion (C), and protrusion (D). Multi-unit activity during submaximal jaw-opening and closing, where the SMUs could not be reliably discriminated throughout the trial, is shown in E. The computer tomography images are shown in F. The format of the Fig. is as in Fig. 2 .
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Figure 3. Percentages of recording sites and active units in different regions of SHLP. (A) Percentages of recording sites in the medial, the middle, and the lateral parts of the SHLP, and the exhibited activity during each task. (B) Percentages of units that were recorded from the medial, the middle, and the lateral parts of the SHLP and that exhibited activity during each task. The number above each bar indicates the number of SMUs.
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