The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association · 2000
Velopharyngeal closure pattern exerted by contraction of the pharyngeal constrictor muscle in dogs.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод пока не подготовлен
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Tanaka S, Kogo M, Hamaguchi M, Matsuya T
Аннотация
OBJECTIVE: This study was performed to investigate aspects of velopharyngeal closure demonstrated by movements of the parapharyngeal wall under various physiological conditions and especially the stimulation of several intrapneumonal receptors.
MATERIALS AND METHODS: Fifteen mongrel dogs were anesthetized and a nasopharyngeal fiberscope was inserted from the oronasal fistula at the center of the hard palate, with the tip fixed around the choana. Mechanical and chemical stimulation was applied, and ongoing velopharyngeal movements were observed. In each case examined, the muscle nerve located under the bilateral levator veli palatini (LVP) was severed.
RESULTS: Two different closure patterns were recognized between rebreathing and deglutition. Chemical stimulation of the pulmonary irritant receptor and type-J receptor induced a sphincteric tight closure of the velopharynx but only a weak inward movement of the lateral pharyngeal wall at lung inflation.
CONCLUSION: The movements of the parapharyngeal wall, mainly represented by the pharyngeal constrictor muscle's contraction, are facilitated as a sphincteric velopharyngeal closure under reflexive movements such as deglutition or gagging.
MATERIALS AND METHODS: Fifteen mongrel dogs were anesthetized and a nasopharyngeal fiberscope was inserted from the oronasal fistula at the center of the hard palate, with the tip fixed around the choana. Mechanical and chemical stimulation was applied, and ongoing velopharyngeal movements were observed. In each case examined, the muscle nerve located under the bilateral levator veli palatini (LVP) was severed.
RESULTS: Two different closure patterns were recognized between rebreathing and deglutition. Chemical stimulation of the pulmonary irritant receptor and type-J receptor induced a sphincteric tight closure of the velopharynx but only a weak inward movement of the lateral pharyngeal wall at lung inflation.
CONCLUSION: The movements of the parapharyngeal wall, mainly represented by the pharyngeal constrictor muscle's contraction, are facilitated as a sphincteric velopharyngeal closure under reflexive movements such as deglutition or gagging.