Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods

The fundamental pattern of chewing induced by the network of neurons called central pattern generator has been reported to be modified by the information arising from the various oro-facial sensory receptors including muscle spindles of jaw closing muscles. The cell bodies of primary afferent neuron...

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Main Authors:	Zakir, H.M., Kitagawa, J., Fathilah, A.R., Bakri, M.M.
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2015
Online Access:	http://journalarticle.ukm.my/8637/ http://journalarticle.ukm.my/8637/ http://journalarticle.ukm.my/8637/1/14_H.M._Zakir.pdf

id	ukm-8637
recordtype	eprints
spelling	ukm-86372016-12-14T06:47:45Z http://journalarticle.ukm.my/8637/ Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods Zakir, H.M. Kitagawa, J. Fathilah, A.R. Bakri, M.M. The fundamental pattern of chewing induced by the network of neurons called central pattern generator has been reported to be modified by the information arising from the various oro-facial sensory receptors including muscle spindles of jaw closing muscles. The cell bodies of primary afferent neurons from these muscle spindles lie in mesencephalic trigeminal nucleus (MTN) in the brainstem. The aim of the study was to understand whether muscle spindles from jaw-closing muscles play any role in hard food chewing. Single neuronal discharge of muscle spindle afferents was recorded from the MTN simultaneous with jaw-movement and electromyograpic (EMG) activities of the left masseter (jaw-closing) muscle during chewing soft and hard foods (apple and pellet) in awake rabbits. Ten consecutive chewing cycles were taken for analysis. Discharge of nineteen muscle spindles from seven rabbits was successfully recorded. Muscle-spindle discharge was significantly higher during the closing phase of jaw-movement for the hard food chewing than for the soft food. The jaw-closing muscle EMG activity was significantly higher during hard food chewing compared to soft food. The spindle discharge was higher when the masseter muscle activity was greater for chewing hard food. Significant positive (r=0.822, p=<0.001) correlation was found between the difference of muscle activity between apple and pellet and the difference of spindle discharge between apple and pellet. Above findings suggest that the increase of spindle discharge during hard food chewing may play a role for facilitating jaw-closing muscle activities and thereby provides servo-assistance to jaw-closing muscles to compensate the hardness of food. Universiti Kebangsaan Malaysia 2015-04 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/8637/1/14_H.M._Zakir.pdf Zakir, H.M. and Kitagawa, J. and Fathilah, A.R. and Bakri, M.M. (2015) Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods. Sains Malaysiana, 44 (4). pp. 593-597. ISSN 0126-6039 http://www.ukm.my/jsm/malay_journals/jilid44bil4_2015/KandunganJilid44Bil4_2015.html
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	The fundamental pattern of chewing induced by the network of neurons called central pattern generator has been reported to be modified by the information arising from the various oro-facial sensory receptors including muscle spindles of jaw closing muscles. The cell bodies of primary afferent neurons from these muscle spindles lie in mesencephalic trigeminal nucleus (MTN) in the brainstem. The aim of the study was to understand whether muscle spindles from jaw-closing muscles play any role in hard food chewing. Single neuronal discharge of muscle spindle afferents was recorded from the MTN simultaneous with jaw-movement and electromyograpic (EMG) activities of the left masseter (jaw-closing) muscle during chewing soft and hard foods (apple and pellet) in awake rabbits. Ten consecutive chewing cycles were taken for analysis. Discharge of nineteen muscle spindles from seven rabbits was successfully recorded. Muscle-spindle discharge was significantly higher during the closing phase of jaw-movement for the hard food chewing than for the soft food. The jaw-closing muscle EMG activity was significantly higher during hard food chewing compared to soft food. The spindle discharge was higher when the masseter muscle activity was greater for chewing hard food. Significant positive (r=0.822, p=<0.001) correlation was found between the difference of muscle activity between apple and pellet and the difference of spindle discharge between apple and pellet. Above findings suggest that the increase of spindle discharge during hard food chewing may play a role for facilitating jaw-closing muscle activities and thereby provides servo-assistance to jaw-closing muscles to compensate the hardness of food.
format	Article
author	Zakir, H.M. Kitagawa, J. Fathilah, A.R. Bakri, M.M.
spellingShingle	Zakir, H.M. Kitagawa, J. Fathilah, A.R. Bakri, M.M. Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods
author_facet	Zakir, H.M. Kitagawa, J. Fathilah, A.R. Bakri, M.M.
author_sort	Zakir, H.M.
title	Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods
title_short	Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods
title_full	Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods
title_fullStr	Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods
title_full_unstemmed	Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods
title_sort	muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods
publisher	Universiti Kebangsaan Malaysia
publishDate	2015
url	http://journalarticle.ukm.my/8637/ http://journalarticle.ukm.my/8637/ http://journalarticle.ukm.my/8637/1/14_H.M._Zakir.pdf
first_indexed	2023-09-18T19:52:52Z
last_indexed	2023-09-18T19:52:52Z
_version_	1777406335558615040

Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods

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