Activity of peri-oral facial muscles and its coordination with jaw muscles during ingestive behavior in awake rabbits

Ootaki, Sachiko; Yamamura, Kensuke; Inoue, Makoto; Amarasena, Jayantha; Kurose, Masayuki; Yamada, Yoshiaki

doi:10.1016/j.brainres.2003.11.037

Cited by 22 publications

(18 citation statements)

References 32 publications

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“…This conclusion is in accord with the clear separation of buccinator and orbicularis oris motor pools within the facial nucleus 24. Independence of buccinator and orbicularis oris EMG patterns is also seen in rabbits7 but not in humans 6. In long-snouted animals the cheek tooth row is so distant from the lips that orbicularis oris activity would not aid in controlling the bolus; thus no coordination between buccinator and orbicularis may be necessary in minipigs.…”

Section: Discussionsupporting

confidence: 64%

“…Of the three species from which detailed buccinator EMG data are now available, pigs resemble humans6 more than rabbits 7. The principal difference is the greater difference of timing between the sides in rabbits, with very late activity in the working side buccinator, corresponding more to the power stroke than to the initiation of closing.…”

Section: Discussionmentioning

confidence: 99%

“…Early electromyographic (EMG) evaluation of the buccinator in humans indicated it was strongly but irregularly active during most oral functions including sucking, blowing, swallowing, smiling, and speech, generally in association with the orbicularis oris muscle 3–5. More recent and complete work in humans6 and in rabbits7 has concentrated instead on the activity of the buccinator in mastication. These studies describe strong activity, differing in both timing and amplitude between working and balancing sides, and changing in response to different quality or quantity of food.…”

Section: Introductionmentioning

confidence: 99%

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The buccinator during mastication: A functional and anatomical evaluation in minipigs

Dutra

Cária

Rafferty

et al. 2010

Archives of Oral Biology

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Objective-The buccinator muscle forms the lateral wall of the oral cavity. It is presumed to aid mastication by maintaining bolus position. Such a function would involve thickening the cheek, possibly compressing the alveolar bone and contributing to malocclusions. However, neither buccinator deformation nor its effect on pressure has been demonstrated. Our objective was to evaluate buccinator EMG during feeding, its changes in length and thickness, and the pressure exerted on its alveolar attachment, using miniature pigs as an animal model. Methods-EMGof the buccinator and other oral muscles was recorded with fine-wire electrodes. Anteroposterior length and mediolateral thickness of the buccinator were evaluated with implanted sonomicrometry crystals, and pressure was measured by flat transducers placed beneath the mandibular origin of the buccinator. Recordings were made during feeding and muscle stimulation. Tissues were collected postmortem for histology.Results-During mastication, buccinator EMG showed regular peaks that preceded those of the jaw closers. Pattern differences clearly distinguished working and balancing sides. The buccinator shortened and thickened when it contracted. Positive pressures were observed at the mandibular attachment of the buccinator, increasing when the muscle was active. Histological evaluation showed a complex interweaving of fibers closely associated with salivary tissue.Conclusions-Buccinator contraction does thicken the cheek, and during mastication this activity takes place just as the closing stroke begins. In addition to controlling the bolus, there may be an effect on salivation. Despite the fact that the muscle pulls on its attachment, the local mechanical environment at the alveolar bone is one of positive pressure.

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The buccinator during mastication: A functional and anatomical evaluation in minipigs

Dutra

Cária

Rafferty

et al. 2010

Archives of Oral Biology

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“…the conditions in prior studies were different from those of eating snacks in daily life. Masticatory movements are complex and achieved by coordination of many organs including not only the jaw and teeth, but also the tongue and cheeks [16]. The masticatory center receives information about changes in the physical properties of foods via sensory organs and then adjusts the timing of contractions and the strengths of muscle groups related to these movements [17].…”

Section: Discussionmentioning

confidence: 99%

Design of safe foods that induce mastication in very young children

Utsumi

Nakamura

Ishizaki

et al. 2015

Pediatric Dental Journal

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“…Those involved with working the food into a bolus are the reduction series, Stage IIa chewing (Masuda et al, 1997;Morimoto et al, 1985), rhythmic chewing period Ootaki et al, 2004;Yamamura et al, 2002), or Type II chews (Schwartz et al, 1989). Those involved with preparing the food for swallowing by introducing the food into the pharynx are the preswallow series, Stage IIb chews (Masuda et al, 1997;Morimoto et al, 1985), the preswallow period Ootaki et al, 2004;Yamamura et al, 2002), or Type III chews (Schwartz et al, 1989).…”

Section: Clinical Significancementioning

confidence: 99%