Neural Control of Superficial and Deep Neck Muscles in Humans

Blouin, Jean-Sébastien, Siegmund, Gunter P., Carpenter, Mark G. and Inglis, J. Timothy (2007) Neural Control of Superficial and Deep Neck Muscles in Humans. Journal of Neurophysiology, 98 2: 920-928. doi:10.1152/jn.00183.2007


Author Blouin, Jean-Sébastien
Siegmund, Gunter P.
Carpenter, Mark G.
Inglis, J. Timothy
Title Neural Control of Superficial and Deep Neck Muscles in Humans
Journal name Journal of Neurophysiology   Check publisher's open access policy
ISSN 0022-3077
Publication date 2007-08
Sub-type Article (original research)
DOI 10.1152/jn.00183.2007
Volume 98
Issue 2
Start page 920
End page 928
Total pages 9
Place of publication Bethesda MD
Publisher American Physiological Society
Language eng
Subject 1109 Neurosciences
Abstract Human neck muscles have a complex multi-layered architecture. The role and neural control of these neck muscles were examined in nine seated subjects performing three series of isometric neck muscle contractions: 50-N contractions in eight fixed horizontal directions, 25-N contractions, and 50-N contractions, both with a continuously changing horizontal force direction. Activity in the left sternocleidomastoid, trapezius, levator scapulae, splenius capitis, semispinalis capitis, semispinalis cervicis, and multifidus muscles was measured with wire electrodes inserted at the C4/C5 level under ultrasound guidance. We hypothesized that deep and superficial neck muscles would function as postural and focal muscles, respectively, and would thus be controlled by different neural signals. To test these hypotheses, electromyographic (EMG) tuning curves and correlations in the temporal and frequency domains were computed. Three main results emerged from these analyses: EMG tuning curves from all muscles exhibited well-defined preferred directions of activation for the 50-N isometric forces, larger contractions (25 vs. 50 N) yielded more focused EMG tuning curves, and agonist neck muscles from all layers received a common neural drive in the range of 10–15 Hz. The current results demonstrate that all neck muscles can exhibit phasic activity during isometric neck muscle contractions. Similar oscillations in the EMG of neck muscles from different layers further suggest that neck motoneurons were activated by common neurons. The reticular formation appears a likely generator of the common drive to the neck motoneurons due to its widespread projections to different groups of neck motoneurons.
Q-Index Code CX

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Health and Rehabilitation Sciences Publications
 
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