Masticatory Muscles


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Related to Masticatory Muscles: Muscles involved in mastication

Masticatory Muscles

 

a group of four paired muscles in man and animals, providing movement of the lower jaw (mandible) during mastication. The masseter muscle, or the masticatory muscle proper, originates from the zygomatic arch and the temporal fascia and attaches to the angle of the mandible. The temporal muscle, originating from the temporal bone and the temporal fascia, attaches to the coronoid process of the mandible. The pterygoideus internus and externus muscles are deeperlying, originating from the sphenoid bone at the base of the skull; the former attaches to the neck of the condyloid process of the mandible, and the latter to the interior surface of the angle of the mandible.

In addition to providing masticatory movement, the masticatory muscles work with the mimetic muscles to articulate speech, facial expression, and yawning. Several neck muscles—the geniohyoid, mylohyoid, and digastric—also provide movement during mastication. Blood is supplied to the masticatory muscles by branches of the carotid artery. Innervation is provided by the third branch of the trigeminal nerve.

References in periodicals archive ?
Assessment of extra-oral and intra-oral masticatory muscles was performed by bilateral palpation for tenderness.
We expected that the position and development of the masticatory muscles would be more different between M.
At the same time, PTs can deprogram the masticatory muscles with soft tissue massage and intraoral mobilizations before the exercises.
(26) investigated relation of the occlusal splint vertical thickness and nocturnal EMG activities of masticatory muscles. The analysis of muscle activities led to a conclusion that occlusal splint with 3-mm vertical thickness at the central incisors was superior to the occlusal splint with 6-mm vertical thickness.
Electromyography of the perioral and masticatory muscles in children with malocclusion, incompetent lips and atypical swallowing--part II.
As reported by Lundquist and Williamson, Dawson, and Kerstein, there will be masticatory muscle activity leading to a contraction in the muscles during closed position, and this will continue when the posterior teeth are in contact during excursive movement.
Other factors, such as other anatomical characteristics, surface area at the point of impact, action of the masticatory muscles, teeth occlusion, and condylar position during the injury, might influence the condylar fracture pattern.
Actual jaw motions and sEMG signals from the masticatory muscles were recorded and used as output and input, respectively, [19].
Patients with known focal central nervous system lesions of the trigeminal nerve system in the medulla and pons may have dissynergism of the masticatory muscles on the basis of clinical and EMG findings, leading to trismus [2, 16].
Farina, "Effect of bolus hardness on the chewing pattern and activation of masticatory muscles in subjects with normal dental occlusion," Journal of Electromyography and Kinesiology, vol.
--Dental status--Extraoral (8 features): face asymmetry caused by dental status, tooth visibility during speech production, unequal jaws, speech clarity, joint mobility, palpatory sensitivity of joints, joint crepitation, palpatory sensitivity of masticatory muscles;