Regional differences in blood flow variation in rat masseter muscle

Niioka, Takeharu; Ishii, Hisayoshi; Izumi, Hiroshi

doi:10.1016/j.archoralbio.2009.08.006

Cited by 16 publications

(11 citation statements)

References 24 publications

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“…less stereotypical) than in others. Lastly, the physiological properties of the masseter muscle are consistent with anatomical and morphological findings such as the focal distribution of the territories of motor units in this muscle [Van Eijden and Turkawski, 2001], the great variability in fiber type composition across various muscle portions [Eriksson and Thornell, 1983], the regional differences in blood perfusion and nerve supply [Niioka et al, 2009], and muscle compartmentalization [Widmer et al, 2007]. Therefore, in order to further investigate the role of stereotypical contractions in the pathophysiology of masticatory muscle pain, it is important to increase our knowledge of the internal architecture of the jaw muscles.…”

Section: Introductionsupporting

confidence: 70%

Macroscopic Analysis of Human Masseter Compartments Assessed by Magnetic Resonance Imaging

Cioffi

Gallo

Palla

et al. 2011

Cells Tissues Organs

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The human masseter is divided into compartments by aponeuroses. So far, the qualitative and quantitative features of these compartments and their aponeuroses have been scarcely investigated. This study investigated the three-dimensional compartmentalization of the masseter muscle and tested the hypothesis that aponeurosis content varies systematically across different masseter subportions as well as between genders. The right masseter of 14 healthy participants was scanned by magnetic resonance, and the outlines of muscle and aponeuroses were segmented and rendered in three dimensions by AMIRA software. The internal architecture of the masseter muscle varied markedly across individuals, with respect to the number, shape and location of the compartments delimited by aponeuroses. Aponeuroses were widely represented inside the masseter, amounting to 7.1 ± 2.1% of its volume. The aponeurosis content varied systematically across masseter subvolumes and did not differ between genders after adjusting for body height and weight.

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Section: Introductionsupporting

confidence: 70%

Macroscopic Analysis of Human Masseter Compartments Assessed by Magnetic Resonance Imaging

Cioffi

Gallo

Palla

et al. 2011

Cells Tissues Organs

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“…The surface of the masseter muscle was ascertained by naked eye. LDF values obtained in this manner represented blood flow in the superficial vessels of the masseter muscle (26). Electrical calibration for zero blood flow was performed for all recordings.…”

Section: Preparation Of Animalsmentioning

confidence: 99%

GABA_B receptors in the NTS mediate the inhibitory effect of trigeminal nociceptive inputs on parasympathetic reflex vasodilation in the rat masseter muscle

Ishii

Izumi

2012

American Journal of Physiology-Regulatory, Integrative and Comp

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Ishii H, Izumi H. GABAB receptors in the NTS mediate the inhibitory effect of trigeminal nociceptive inputs on parasympathetic reflex vasodilation in the rat masseter muscle. Am J Physiol Regul Integr Comp Physiol 302: R776 -R784, 2012. First published January 4, 2012; doi:10.1152/ajpregu.00569.2011.-The present study was designed to examine whether trigeminal nociceptive inputs are involved in the modulation of parasympathetic reflex vasodilation in the jaw muscles. This was accomplished by investigating the effects of noxious stimulation to the orofacial area with capsaicin, and by microinjecting GABA A and GABAB receptor agonists or antagonists into the nucleus of the solitary tract (NTS), on masseter hemodynamics in urethane-anesthetized rats. Electrical stimulation of the central cut end of the cervical vagus nerve (cVN) in sympathectomized animals bilaterally increased blood flow in the masseter muscle (MBF). Increases in MBF evoked by cVN stimulation were markedly reduced following injection of capsaicin into the anterior tongue in the distribution of the lingual nerve or lower lip, but not when injected into the skin of the dorsum of the foot. Intravenous administration of either phentolamine or propranolol had no effect on the inhibitory effects of capsaicin injection on the increases of MBF evoked by cVN stimulation, which were largely abolished by microinjecting the GABA B receptor agonist baclofen into the NTS. Microinjection of the GABAB receptor antagonist CGP-35348 into the NTS markedly attenuated the capsaicin-induced inhibition of MBF increase evoked by cVN stimulation, while microinjection of the GABA A receptor antagonist bicuculline did not. Our results indicate that trigeminal nociceptive inputs inhibit vagal-parasympathetic reflex vasodilation in the masseter muscle and suggest that the activation of GABA B rather than GABA A receptors underlies the observed inhibition in the NTS.capsaicin; cervical vagus nerve; baclofen; bicuculline; CGP-35348

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“…Additionally, it was developed experimentally as a method for evaluating blood flow in the orofacial area during mastication in the rat masseter muscle, which revealed hemodynamics during rest and sympathetic and parasympathetic stimulation. 20 As previously described, the nature of blood flow in gingival tissue is often controversial in dentistry; however, LSI measurement has not been applied. 21 This study focused on the gingiva and mucosa surrounding anterior implants and captured thermographs to elucidate the relationship between temperature and blood flow because peri-implant soft tissues are always described as having lower blood flow because of the lack of blood supply from the periodontal ligament.…”

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confidence: 99%

Two-Dimensional Real-Time Blood Flow and Temperature of Soft Tissue Around Maxillary Anterior Implants

et al. 2012

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Regional differences in blood flow variation in rat masseter muscle

Cited by 16 publications

References 24 publications

Macroscopic Analysis of Human Masseter Compartments Assessed by Magnetic Resonance Imaging

Macroscopic Analysis of Human Masseter Compartments Assessed by Magnetic Resonance Imaging

GABA_B receptors in the NTS mediate the inhibitory effect of trigeminal nociceptive inputs on parasympathetic reflex vasodilation in the rat masseter muscle

Two-Dimensional Real-Time Blood Flow and Temperature of Soft Tissue Around Maxillary Anterior Implants

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