Non-invasive assessment of motor unit anatomy in jaw-elevator muscles

summary The estimation of fibre length in jaw‐elevator muscles is important for modelling studies and clinical applications. The objective of this study was to identify, from multi‐channel surface EMG recordings, the main innervation zone(s) of the superficial masseter and anterior temporalis muscle...

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Published inJournal of oral rehabilitation Vol. 32; no. 10; pp. 708 - 713
Main Authors CASTROFLORIO, T., FARINA, D., BOTTIN, A., DEBERNARDI, C., BRACCO, P., MERLETTI, R., ANASTASI, G., BRAMANTI, P.
Format Journal Article
LanguageEnglish
Published Oxford, UK Blackwell Science Ltd 01.10.2005
Subjects
Online AccessGet full text
ISSN0305-182X
1365-2842
DOI10.1111/j.1365-2842.2005.01490.x

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Abstract summary The estimation of fibre length in jaw‐elevator muscles is important for modelling studies and clinical applications. The objective of this study was to identify, from multi‐channel surface EMG recordings, the main innervation zone(s) of the superficial masseter and anterior temporalis muscles, and to estimate the fibre length of these muscles. Surface EMG signals were collected from 13 subjects with a 16‐electrode linear array. The innervation zones of the masseter and anterior temporalis were identified and their variability intra‐ and inter‐subject outlined. More than one main innervation zone location was identified in the masseter of all subjects and in the temporalis anterior of 12 subjects. Average estimated fibre lengths, for the right (left) side, were (mean ± SD) 27·3 ± 2·4 mm (27·0 ± 1·7 mm) and 25·9 ± 2·3 mm (26·6 ± 1·6 mm), for the superficial masseter and temporalis anterior muscle, respectively. The range of innervation zone locations was up to approximately 50% of the fibre length, both within and between subjects. Fibre length estimates well matched with published data on cadavers. It was concluded that multi‐channel surface EMG provides important and reliable information on the anatomy of single motor units in jaw‐elevator muscles.
AbstractList The estimation of fibre length in jaw-elevator muscles is important for modelling studies and clinical applications. The objective of this study was to identify, from multi-channel surface EMG recordings, the main innervation zone(s) of the superficial masseter and anterior temporalis muscles, and to estimate the fibre length of these muscles. Surface EMG signals were collected from 13 subjects with a 16-electrode linear array. The innervation zones of the masseter and anterior temporalis were identified and their variability intra- and inter-subject outlined. More than one main innervation zone location was identified in the masseter of all subjects and in the temporalis anterior of 12 subjects. Average estimated fibre lengths, for the right (left) side, were (mean+/-SD) 27.3+/-2.4 mm (27.0+/-1.7 mm) and 25.9+/-2.3 mm (26.6+/-1.6 mm), for the superficial masseter and temporalis anterior muscle, respectively. The range of innervation zone locations was up to approximately 50% of the fibre length, both within and between subjects. Fibre length estimates well matched with published data on cadavers. It was concluded that multi-channel surface EMG provides important and reliable information on the anatomy of single motor units in jaw-elevator muscles.The estimation of fibre length in jaw-elevator muscles is important for modelling studies and clinical applications. The objective of this study was to identify, from multi-channel surface EMG recordings, the main innervation zone(s) of the superficial masseter and anterior temporalis muscles, and to estimate the fibre length of these muscles. Surface EMG signals were collected from 13 subjects with a 16-electrode linear array. The innervation zones of the masseter and anterior temporalis were identified and their variability intra- and inter-subject outlined. More than one main innervation zone location was identified in the masseter of all subjects and in the temporalis anterior of 12 subjects. Average estimated fibre lengths, for the right (left) side, were (mean+/-SD) 27.3+/-2.4 mm (27.0+/-1.7 mm) and 25.9+/-2.3 mm (26.6+/-1.6 mm), for the superficial masseter and temporalis anterior muscle, respectively. The range of innervation zone locations was up to approximately 50% of the fibre length, both within and between subjects. Fibre length estimates well matched with published data on cadavers. It was concluded that multi-channel surface EMG provides important and reliable information on the anatomy of single motor units in jaw-elevator muscles.
summary The estimation of fibre length in jaw‐elevator muscles is important for modelling studies and clinical applications. The objective of this study was to identify, from multi‐channel surface EMG recordings, the main innervation zone(s) of the superficial masseter and anterior temporalis muscles, and to estimate the fibre length of these muscles. Surface EMG signals were collected from 13 subjects with a 16‐electrode linear array. The innervation zones of the masseter and anterior temporalis were identified and their variability intra‐ and inter‐subject outlined. More than one main innervation zone location was identified in the masseter of all subjects and in the temporalis anterior of 12 subjects. Average estimated fibre lengths, for the right (left) side, were (mean ± SD) 27·3 ± 2·4 mm (27·0 ± 1·7 mm) and 25·9 ± 2·3 mm (26·6 ± 1·6 mm), for the superficial masseter and temporalis anterior muscle, respectively. The range of innervation zone locations was up to approximately 50% of the fibre length, both within and between subjects. Fibre length estimates well matched with published data on cadavers. It was concluded that multi‐channel surface EMG provides important and reliable information on the anatomy of single motor units in jaw‐elevator muscles.
summary The estimation of fibre length in jaw‐elevator muscles is important for modelling studies and clinical applications. The objective of this study was to identify, from multi‐channel surface EMG recordings, the main innervation zone(s) of the superficial masseter and anterior temporalis muscles, and to estimate the fibre length of these muscles. Surface EMG signals were collected from 13 subjects with a 16‐electrode linear array. The innervation zones of the masseter and anterior temporalis were identified and their variability intra‐ and inter‐subject outlined. More than one main innervation zone location was identified in the masseter of all subjects and in the temporalis anterior of 12 subjects. Average estimated fibre lengths, for the right (left) side, were (mean ± SD) 27·3 ± 2·4 mm (27·0 ± 1·7 mm) and 25·9 ± 2·3 mm (26·6 ± 1·6 mm), for the superficial masseter and temporalis anterior muscle, respectively. The range of innervation zone locations was up to approximately 50% of the fibre length, both within and between subjects. Fibre length estimates well matched with published data on cadavers. It was concluded that multi‐channel surface EMG provides important and reliable information on the anatomy of single motor units in jaw‐elevator muscles.
The estimation of fibre length in jaw-elevator muscles is important for modelling studies and clinical applications. The objective of this study was to identify, from multi-channel surface EMG recordings, the main innervation zone(s) of the superficial masseter and anterior temporalis muscles, and to estimate the fibre length of these muscles. Surface EMG signals were collected from 13 subjects with a 16-electrode linear array. The innervation zones of the masseter and anterior temporalis were identified and their variability intra- and inter-subject outlined. More than one main innervation zone location was identified in the masseter of all subjects and in the temporalis anterior of 12 subjects. Average estimated fibre lengths, for the right (left) side, were (mean+/-SD) 27.3+/-2.4 mm (27.0+/-1.7 mm) and 25.9+/-2.3 mm (26.6+/-1.6 mm), for the superficial masseter and temporalis anterior muscle, respectively. The range of innervation zone locations was up to approximately 50% of the fibre length, both within and between subjects. Fibre length estimates well matched with published data on cadavers. It was concluded that multi-channel surface EMG provides important and reliable information on the anatomy of single motor units in jaw-elevator muscles.
Author MERLETTI, R.
BRACCO, P.
BRAMANTI, P.
DEBERNARDI, C.
CASTROFLORIO, T.
FARINA, D.
BOTTIN, A.
ANASTASI, G.
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Snippet summary The estimation of fibre length in jaw‐elevator muscles is important for modelling studies and clinical applications. The objective of this study was to...
summary The estimation of fibre length in jaw‐elevator muscles is important for modelling studies and clinical applications. The objective of this study was to...
The estimation of fibre length in jaw-elevator muscles is important for modelling studies and clinical applications. The objective of this study was to...
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SubjectTerms Adult
Electromyography - methods
Female
fibre length
Humans
innervation zone
Jaw - innervation
linear electrode arrays
Male
Masseter Muscle - innervation
Masticatory Muscles - innervation
Motor Neurons - cytology
Muscle Fibers, Skeletal
surface electromyography
Title Non-invasive assessment of motor unit anatomy in jaw-elevator muscles
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https://onlinelibrary.wiley.com/doi/abs/10.1111%2Fj.1365-2842.2005.01490.x
https://www.ncbi.nlm.nih.gov/pubmed/16159347
https://www.proquest.com/docview/68578354
Volume 32
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