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悬雍垂的主体是起自腭腱膜,向后纵行走向的悬雍垂肌,收缩时将悬雍垂向后上方牵拉,使之缩短,增强软腭张力,促进腭咽闭合。婴儿与成人相比,腭肌相对较大,口腔上下距离较短,喉位置较高(新生儿会厌缘平颈1水平,环状软骨下缘平颈4),故婴儿悬雍垂较长,易直接触及声门上构造或直达声门部,可对呼吸道产生直接阻塞或因对喉粘膜的喉上神经形成刺激,进而诱发反射性喉痉挛,导致患儿有间歇性呼吸窘迫或呼吸暂停,其特点是安静时较易出现,而哭叫时由于悬雍垂肌等腭肌的收缩反可减轻。1～3月婴儿较其它年龄组
The main body of the uvula is from the palatal fascia, back to the longitudinal uvula longitudinal contraction of the uvula will be pulled back to the top, so that shorten and enhance the soft palate tension and promote the velopharyngeal closure. Compared with infants and adults, the palate muscle is relatively large, short distance up and down the mouth, the laryngeal position is high (neonatal epiglottis level neck level 1, the lower edge of the ring neck flat neck 4), so the baby uvula longer, easy to direct Touching the supraglottic structure or direct glottic door, the respiratory tract can be blocked directly or due to laryngeal nerve laryngeal nerve formation stimuli, and then induced reflex laryngospasm, resulting in children with intermittent respiratory distress or apnea, its characteristics Is more likely to appear when quiet, but when crying due to uvula and other palate muscle contraction can be reduced. 1 to 3 months baby than other age groups