masseter

(redirected from masseters)
Also found in: Dictionary, Thesaurus, Encyclopedia.

mas·se·ter (mus·cle)

[TA]
masticatory muscle of posterior cheek; origin, superficial part: inferior border of the anterior two thirds of the zygomatic arch; deep part: inferior border and medial surface of the zygomatic arch; insertion, lateral surface of ramus and coronoid process of the mandible; action, elevates mandible (closes jaw); nerve supply, masseteric branch of mandibular division of trigeminal.
Synonym(s): musculus masseter [TA]

masseter

(mə-sē′tər, mă-)
n.
A thick muscle in the cheek that closes the jaws during chewing.

mas′se·ter′ic (măs′ĭ-tĕr′ĭk) adj.

masseter

The major jaw muscle, which participates in protraction, retraction and side to side movement of the jaw.

Action
Closes jaw.
 
Nerve
Mandibular branch of trigeminal.

Origin, superficial part
Zygomatic process of maxilla, inferior border of zygomatic arch.
 
Origin, deep part
Inferior border and medial suface of zygomatic arch.
 
Insertion, superficial part
Angle, ramus of mandible.
 
Insertion, deep part
Superior ramus, lateral coronoid process of mandible.

masseter

A short, thick, paired muscle in each cheek running down from the cheekbone (zygomatic arch) to the outer corner of the jawbone (mandible). The masseters act to raise the lower jaw and compress the teeth together in the act of chewing.

masseter

the chewing muscle which raises the lower jaw.
References in periodicals archive ?
Stages of the electromyographic evaluation protocol of masseter muscles Test 01--Rest The participant was instructed to stay in the usual position, without speaking, chewing or swallowing for 5 seconds, while the electromyographic examination was performed.
In this study, the SMVA represented 100% of the electrical activity of the masseter muscle on each side.
In the results of differences in electromyographic activity between Group I and II of masseter muscles under resting conditions, SMVA, chewing and percentage of maximum electrical activity, it can be observed that the mean values were higher in the Group II for all variables studied on the right side.
For the lateral tongue, cheek, and masseter, stiffness and frequency were significantly greater during contraction than in the relaxed condition.
Stiffness, frequency, and decrement values for the lateral tongue, cheek, and masseter changed in the expected manner, with increased stiffness and frequency and decreased decrement during observable contraction of the target muscles.
Muscle spindle afferent input to motoneurons in human masseter. J Neurophysiol.
Moller (15) used surface electromyography (sEMG) and proposed it as a reliable method considering that myoelectric activity levels are higher in the masseter muscles of the chewing side compared to the side with no masticatory activity.
This study evaluated the activity of the right and left masseter by choosing a bipolar configuration which is sensitive to changes in the force exerted by muscles.
Specifically, Tables 2 and 3 demonstrate how subjects showed much less masseter and frontalis reactivity to the music during the second exposure than the first; t (17) = 2.62, p < .05 for the masseter muscles (EMG2) and t (17) = 3.19, p < .01 for the frontalis muscle (EMG 1).
Specifically, our findings suggest that heavy metal music elicits a physiological response in females, with significant differences between the silence and music conditions being focused at the masseter muscles during initial exposure.
Neste estudo foram avaliados os musculos masseteres e temporais anteriores (direito e esquerdo) de 23 sujeitos (11 mulheres e 12 homens com idade media de 25 e 23 anos, respectivamente), sem sinais ou sintomas de DTM, dor de cabeca ou apertamento dentario.
Apos cada bloco, bem como 20 minutos e 24 horas apos seu termino, eram mensurados escores de fadiga e dor muscular (por meio de escala analogica visual--EAV) e amplitude do reflexo de estiramento mandibular para o musculo masseter esquerdo.