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Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits

The relationships between jaw-closing muscle spindle unit discharge and the hardness of foods were evaluated during chewing in awake rabbits. Spindle unit discharges recorded from the left mesencephalic trigeminal nucleus were correlated with the simultaneous recording of jaw movements and electro...

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Main Author: Zakir, H.M.
Format: Article
Published: Elsevier 2010
Subjects:
RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
RK Dentistry
Online Access:http://eprints.um.edu.my/8521/
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spelling my.um.eprints.85212014-06-10T02:19:27Z http://eprints.um.edu.my/8521/ Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits Zakir, H.M. RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry RK Dentistry The relationships between jaw-closing muscle spindle unit discharge and the hardness of foods were evaluated during chewing in awake rabbits. Spindle unit discharges recorded from the left mesencephalic trigeminal nucleus were correlated with the simultaneous recording of jaw movements and electromyographic (EMG) activities of the left masseter (jaw-closing) muscle during chewing soft and hard foods. A chewing cycle was divided into the fast-closing (FC), slow-closing (SC) and opening (OP) phases according to jaw movements. The chewing was classified as ipsilateral and contralateral chewing according to ipsilateral and contralateral to the recording side of the neuron, respectively. Spindle unit discharge was significantly higher during the FC and SC phases of the hard food than the soft food during both ipsilateral and contralateral chewing. The discharge was observed to be higher when the masseter muscle activity was higher. A comparison between the chewing sides reveals that the discharge was significantly higher during the slow-closing phase of ipsilateral chewing than contralateral chewing. From the above findings, the relationship of the spindle unit discharge with the hardness of foods was observed. Moreover, this relationship exists even when an animal chews food on the contralateral side suggesting the significance of the muscle spindle information for smooth chewing. In addition, the phase dependent difference of the spindle unit discharge between chewing sides suggests the distinct roles of the spindle information on the chewing and non-chewing sides. Elsevier 2010 Article NonPeerReviewed Zakir, H.M. (2010) Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits. Brain Research Bulletin.
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
RK Dentistry
spellingShingle RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
RK Dentistry
Zakir, H.M.
Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits
description The relationships between jaw-closing muscle spindle unit discharge and the hardness of foods were evaluated during chewing in awake rabbits. Spindle unit discharges recorded from the left mesencephalic trigeminal nucleus were correlated with the simultaneous recording of jaw movements and electromyographic (EMG) activities of the left masseter (jaw-closing) muscle during chewing soft and hard foods. A chewing cycle was divided into the fast-closing (FC), slow-closing (SC) and opening (OP) phases according to jaw movements. The chewing was classified as ipsilateral and contralateral chewing according to ipsilateral and contralateral to the recording side of the neuron, respectively. Spindle unit discharge was significantly higher during the FC and SC phases of the hard food than the soft food during both ipsilateral and contralateral chewing. The discharge was observed to be higher when the masseter muscle activity was higher. A comparison between the chewing sides reveals that the discharge was significantly higher during the slow-closing phase of ipsilateral chewing than contralateral chewing. From the above findings, the relationship of the spindle unit discharge with the hardness of foods was observed. Moreover, this relationship exists even when an animal chews food on the contralateral side suggesting the significance of the muscle spindle information for smooth chewing. In addition, the phase dependent difference of the spindle unit discharge between chewing sides suggests the distinct roles of the spindle information on the chewing and non-chewing sides.
format Article
author Zakir, H.M.
author_facet Zakir, H.M.
author_sort Zakir, H.M.
title Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits
title_short Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits
title_full Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits
title_fullStr Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits
title_full_unstemmed Modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits
title_sort modulation of spindle discharge from jaw-closing muscles during chewing foods of different hardness in awake rabbits
publisher Elsevier
publishDate 2010
url http://eprints.um.edu.my/8521/
_version_ 1643688320405864448
score 13.211869

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