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Topic: Masseter muscle

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Muscular system

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	Effects of two different units of botulinum toxin type a evaluated by computed tomography and electromyographic ...
		The aim of this study was to evaluate the effects of two different quantities of botulinum toxin type A on the thickness and cross-sectional area and electromyographic changes in the masseter muscle using computed tomography and electromyographic measurement.
		The thickness and cross-sectional area of the masseter muscle were measured at three positions before and 12 weeks after injection using computed tomography.
		The electromyographic changes in the masseter muscle during maximum voluntary clenching were also evaluated before and 2, 4, 12, and 24 weeks after injection.
	botox.researchtoday.net /archive/4/1/180.htm (371 words)

	Masseter muscle - Wikipedia, the free encyclopedia
		In human anatomy, the masseter is one of the muscles of mastication.
		The deep portion of the muscle is partly concealed, in front, by the superficial portion; behind, it is covered by the parotid gland.
		Along with temporalis, the masseter muscle is supplied by the mandibular division of the trigeminal nerve.
	en.wikipedia.org /wiki/Masseter (353 words)

	William P. Wall and Sherri J. Hayes (Site not responding. Last check: 2007-10-29)
		The lateralis is the smallest of the masseter muscles in the guinea pig.
		The medial masseter is the smallest component of the masseter muscle in the myomorph.
		It is the smallest of the masseter muscles in the squirrel.
	www2.nature.nps.gov /Geology/paleontology/pub/grd2/gsa04.htm (2663 words)

	www.tmj-tmd.com - Cosmetic and Restorative Dentist Rhys Spoor
		In 39 patients with functional disorders of the temporomandibular joint and the muscles of mastication and in 45 controls, the activity in the temporal and masseter muscles was recorded with the subjects seated upright and the mandible at rest.
		The pattern of elevator muscle activity using bipolar surface EMG of the temporalis and masseter muscles during mastication in 37 patients with pain and dysfunction and 43 control subjects was studied before and after treatment.
		The EMG activities of the masseter muscles and the anterior and posterior temporalis muscles were investigated in different vertical and sagittal jaw relations using surface electrodes.
	www.tmj-tmd.com /articles.htm (10046 words)

	Masseter Muscle of the Face
		Masseter is one of the most powerful muscles for its size in the body.
		This muscle functions to chew food and derives its name from the Greek for chewing, and is associated with angry and aggressive states.
		Masseter is innervated by the masseteric nerve of the mandibular division of the trigeminal nerve (V) and is supplied with blood by the superficial temporal, maxillary, and facial arteries.
	face-and-emotion.com /dataface/expression/masseter.html (115 words)

	Molecular Pain \| Full text \| Contrasting phenotypes of putative proprioceptive and nociceptive trigeminal neurons ...
		The masseter muscle is involved in many painful conditions which are grouped under the general heading of temporomandibular disorders [1].
		in 6/15 (40%) of masseter afferents (inhibition of I
		There is considerable evidence that a proportion of muscle afferents can reliably signal stimuli in both the innocuous and noxious range, and the properties of some of these afferents are consistent with the expression patterns of the channels in muscle afferents found in the present study [9].
	www.molecularpain.com /content/1/1/31 (6262 words)

	Superiorly based and island masseter muscle flaps for repairing oropharyngeal defects.
		Superiorly based and island masseter muscle flaps for repairing oropharyngeal defects.
		The first type is the superiorly based or cross-over masseter muscle flap, and the second type the island muscle flap (being a modification of the first type).
		RESULTS: The superiorly based masseter muscle flap was used in 12 patients and the island masseter muscle flap in 10.
	bonegrafts.researchtoday.net /archive/2/9/274.htm (288 words)

	INABIS'98 - Histological study of the healing process of the attachment site of rat masseter muscle following injury
		The masseter muscle, which is one of muscle of mastication, functions by attaching itself to the the mandible.
		The masseter muscle functions by attaching itself to the mandible, and thus close correlation between the muscle and bone exists.
		Thus, it is important to study the relationship between the masseter muscle and mandible to clarify the complex movement of the jaw.
	www.mcmaster.ca /inabis98/medicine/abe0220/two.html (243 words)

	Development of the masseter muscle and oral behavior in the pig. (Site not responding. Last check: 2007-10-29)
		During mastication the adult pig masseter contracts with a complex pattern involving a wave of electromyographic (EMG) activity moving from the ventro-rostral corner to the dorso-caudal corner.
		EMG activity from different parts of the masseter was recorded along with oral movements in infant and juvenile pigs as they suckled, drank, and chewed on food and non-food objects.
		Fetal masseters were oriented generally more horizontally than the masseters of older animals, except that the dorso-caudal corner, usually the most horizontal portion, is not developed in fetuses.
	www.arclab.org /medlineupdates/abstract_3950565.html (250 words)

	INABIS'98 - Histological study of the healing process of the attachment site of rat masseter muscle following injury
		The results of the present study show that the attachment site of the deep layer of the masseter muscle in rats can be divided into three areas: the tendinous attachment, periosteal attachment and transition phase between the tendinous attachment and periosteal attachment.
		A histological study on the migration mechanism of the attachment of the deep layer of the masseter muscle to the rat mandible during growth, Jpn J Oral Biol 27:254-271.(in Japanese)
		Ultrastructural study on the migration mechanism of the attachment of the deep layer of masseter muscle to the rat mandible during growth, Jpn J Oral Biol 30: 664-682.(in Japanese)
	www.mcmaster.ca /inabis98/medicine/abe0220/discussion.html (461 words)

	Sex-Related Differences in Human Pain and Rat Afferent Discharge Evoked by Injection of Glutamate Into the Masseter ...
		masseter muscle was surgically excised, and it was confirmed that
		masseter muscle afferents was significantly greater in female than in male rats.
		Neither men nor women appeared to be able to discriminate between masseter muscle injection of 0.5 M and 1.0 M glutamate.
	jn.physiology.org /cgi/content/full/86/2/782 (7154 words)

	Human Anatomy - Lab 27 Step 2 (Site not responding. Last check: 2007-10-29)
		Detach the masseter muscle from the zygomatic arch.
		As the masseter muscle is reflected inferiorly, identify the nerve and vessels to the masseter muscle
		Cut the nerve and vessels, and complete the reflection of the masseter muscle towards its attachment to the angle of the mandible.
	ect.downstate.edu /courseware/haonline/labs/l27/020104.htm (84 words)

	[No title] (Site not responding. Last check: 2007-10-29)
		The participants were examined clinically with special consideration to the masseter muscle and the pressure pain threshold as well as tolerance levels of this muscle were assessed.
		Serotonin was present in the masseter muscle and the level was significantly higher in the initial sample than in the sample collected during steady state.
		The level of serotonin in the masseter muscle in relation to the level of serotonin in the blood serum was calculated.
	www.fibromyalgiasupport.com /library/print.cfm?ID=1535 (326 words)

	Activation of Peripheral NMDA Receptors Contributes to Human Pain and Rat Afferent Discharges Evoked by Injection of ...
		the masseter muscle evoked afferent discharges in a concentration-related
		the masseter muscle evokes afferent discharges in rats and muscle
		masseter muscle afferent fiber discharges in rats and masseter
	jn.physiology.org /cgi/content/full/90/4/2098 (5129 words)

	APStracts 8:0198J, 2001. (Site not responding. Last check: 2007-10-29)
		Therefore, we examined whether injection of glutamate into the masseter muscle induces pain in male and female volunteers and, since masseter afferent recordings were not feasible in humans, whether glutamate excites putative nociceptive afferents supplying the masseter muscle of male and female rats.
		In rats of both sexes, glutamate (10 ?l, 0.5 M) evoked activity in a subpopulation of masseter muscle afferents (n=36) which projected to the subnucleus caudalis, an important relay of noxious input from the craniofacial region.
		These results indicate that glutamate injection into the masseter muscle evokes pain responses which are greater in women than men and that one possible mechanism for this difference may be a greater sensitivity to glutamate of masseter muscle afferents in females.
	www.uth.tmc.edu /apstracts/2001/jn/June/198j.html (433 words)

	Exam 2 Answer Key, 2000
		The masseter muscle ran from the lower jaw to the underside of the zygomatic arch only, leaving the first cheek teeth uncovered.
		In addition, there may be flanges (projections) from the forward edge of the zygomatic arch to which portions of the masseter muscle attach.
		In hystricomorphs, there is a very large hole in the front of the zygomatic arch through which a large portion of the masseter muscle passes before attaching to the rostrum.
	www.life.umd.edu /classroom/bsci338m/tests/KeyNo2.html (931 words)

	Massage Therapy for Bruxism, TMJ Syndrome
		Ounce for ounce, masseter may be the strongest muscle in the human body, although many variables make this is difficult to measure.
		Of course, masseter is also implicated in bruxism (grinding and cracking of molars), and in temporomandibular joint syndrome (slow, painful failure of the jaw joint).
		The muscle attaches to the underside of the cheekbone on the side of the face: from just in front of the ear to just behind the most prominent curve of the cheekbone.
	vancouvermassage.ca /articles/spot-07.php (539 words)

	Buccinator Muscle Image - ... - satelliteimages.theused.be (Site not responding. Last check: 2007-10-29)
		crosses the masseter muscle to pierce the buccinator muscle opposite the upper 2nd molar tooth.
		380) is a thin quadrilateral muscle, occupying the...
		The masseter is a muscle of mastication, not facial expression but it is superficial in the face.
	satelliteimages.theused.be /.../buccinator-muscle-image.html (558 words)

	Spatial Distribution of Myosin Heavy-chain Isoforms in Mouse Masseter -- Widmer et al. 81 (1): 33 -- Journal of Dental ...
		The adult masseter muscle is a complex multipennate muscle that
		Comparison of myosins from the masseter muscle of adult rat, mouse and guinea pig.
		Persistance of neonatal-type isoforms in the murine muscle.
	jdr.iadrjournals.org /cgi/content/full/81/1/33 (3751 words)

	Buccinator Muscle Image - ... - satelliteimages.poetrycontest.be (Site not responding. Last check: 2007-10-29)
		its anterior border to pierce the buccinator muscle.
		The masseter is a muscle of mastication, not...
		Feel all that tension drain away, muscle by muscle, as your mind is filled with pleasant, sunny images.
	satelliteimages.poetrycontest.be /.../buccinator-muscle-image.html (556 words)

	Elevation of histidine decarboxylase activity in skeletal muscles and stomach in mice by stress and exercise -- Ayada ...
		Elevation of histidine decarboxylase activity in skeletal muscles and stomach in mice by stress and exercise -- Ayada et al.
		muscles (6, 27), and healing of damaged joints is slow (17).
		muscle tissues by means of an immunostaining technique (11).
	ajpregu.physiology.org /cgi/content/full/279/6/R2042 (4019 words)

	Three-dimensional morphology of the masseter muscle in patients with mandibular prognathism -- Ariji et al. 29 (2): 113 ...
		Three-dimensional morphology of the masseter muscle in patients with mandibular prognathism -- Ariji et al.
		Three-dimensional morphology of the masseter muscle in patients with mandibular prognathism
		CONCLUSION: The morphology of the masseter muscle in mandibular
	dmfr.birjournals.org /cgi/content/abstract/29/2/113 (290 words)

	Self-treatment Examples, trigger point Massage for Myofascial pain
		They can be responsible for a sense of sinus pressure or congestion.
		The illustration shows massage of the masseter muscles with the thumb and fingers.
		You may not have ever thought about it, but the muscles of the lower leg are actually foot muscles.
	www.triggerpointbook.com /examples.htm (549 words)

	PT Central - Complete Muscle Tables for the Human Body
		Included is each muscle's origin, insertion, action, blood supply and innervation.
		Select here to print the Hosford Muscle Tables in a compact table form.
		Once in a region, you will be able to focus further on the muscles of that region.
	www.ptcentral.com /muscles (192 words)

	masseter \| English \| Dictionary & Translation by Babylon
		In human anatomy, the masseter is one of the muscles of mastication.
		It is particularly powerful in herbivores to assist when they are chewing plants.The masseter is a thick, somewhat quadrilateral muscle, consisting of two portions, superficial and deep.
		a large muscle that raises the lower jaw and is used in chewing
	www.babylon.com /definition/masseter (86 words)

	Effect of local glucocorticoid injection on masseter muscle level of serotonin in patients with chronic myalgia
		The aim of this study was to compare the effects on the level of serotonin (5-HT) in the masseter muscle by intramuscular glucocorticoid (GC) administration in patients with fibromyalgia (FM) and localized myalgia (LM), as well as to determine associated changes in pain, tenderness, and microcirculation.
		The study comprised 22 patients with pain and tenderness in the masseter muscle region.
		This study indicates that there is a reduction of the ratio between initial 5-HT and steady state level in the painful masseter muscle after intramuscular GC administration to FM patients, a reduction not present in the LM patients.
	www.immunesupport.com /library/showarticle.cfm/ID/1764 (411 words)

	Neuromuscular Evaluation & Treatment Technologies for Dentistry
		Jankelson, Robert (1990) Analysis of maximal electromyographic activity of the masseter and anterior temporalis muscles in Myocentric and Habitual Centric in Temporomandibular Joint and Musculoskeletal Dysfunction. Front.
		The restoration of the dysfunctional patient to a neuromuscular myocentric occlusion results in significantly increased function and synergy of the anterior temporalis and masseter muscles.
		The average electromyograph activity with the patient clenching increased substantially in the left and right anterior temporalis and masseter muscles after treatment.
	www.myotronics.com /learning.cfm?id=2 (708 words)

	Swelling at the Angle of the Mandible: Imaging of the Pediatric Parotid Gland and Periparotid Region -- Lowe et al. 21 ... (Site not responding. Last check: 2007-10-29)
		A portion of the superficial parotid lobe has been removed to show its relationship with the facial nerve and retromandibular vein, which divide the parotid gland into superficial and deep lobes.
		D = posterior belly of digastric muscle, I = internal carotid artery, J = jugular vein, M = masseter muscle, R = retromandibular vein, S = sternocleidomastoid muscle.
		M = masseter muscle, P = parotid gland.
	intl-radiographics.rsnajnls.org /cgi/content/figsonly/21/5/1211 (2059 words)

	Clipart of Lateral view of skull showing the muscles used in chewing; masseter muscle and temporal muscle. - Search ... (Site not responding. Last check: 2007-10-29)
		Clipart of Lateral view of skull showing the muscles used in chewing; masseter muscle and temporal muscle.
		Lateral view of skull showing the muscles used in chewing; masseter muscle and temporal muscle.
		chewing, head, lateral, masseter, mastication, muscle, muscles, skull, temporal, used, face, illustration, illustrations, clip art, clipart, picture, pictures, graphic, graphics, drawing, drawings, artwork, royalty free, sa403021
	www.fotosearch.com /LIF115/sa403021 (266 words)

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