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Valsalva(1717)首次描述环咽肌并区别于咽下缩肌。Killian(1908)将环咽肌分为斜部和横部(pars fundiformis,呈吊带状,即该肌下部的括约肌部分)两者可明显分开,并认为后者是收缩肌构成食管唇部以闭合食管口。咽与食管间无明确的分界线。近来多集中于上部食管括约肌的神经肌肉功能障碍研究,但有关婴幼儿的资料缺乏,由于新生儿多仰卧喂流质,易于反流而增加气管吸入的危险,故对其括约肌功能的完善更显重要。
Valsalva (1717) first described the cricopharyngeal muscle and distinguished it from the hypopharyngeal constrictor. Killian (1908) separated the pharyngeal pharyngis into pars fundiformis (sling-like, the sphincter portion of the lower part of the muscle) clearly and considered the latter to be the contracting muscle to form the esophageal lip to close Esophageal orifice. Pharyngeal and esophageal no clear dividing line. Recently, most studies have focused on the neuromuscular dysfunction of the upper esophageal sphincter. However, due to the lack of information on infants and young children, it is more important for their sphincter function to be improved due to the increased risk of tracheal aspiration due to more supine feeding of fluid in the newborn, .