Amis T C, O'Neill N, Brancatisano A
Department of Respiratory Medicine, Westmead Hospital, NSW, Australia.
Respir Physiol. 1996 Jul;104(2-3):179-85. doi: 10.1016/0034-5687(96)00030-8.
We examined the effect of hyoepiglotticus (HE) muscle contraction on epiglottic position in 4 anaesthetised (IV choralose, pentobarbitone sodium) tracheostomised, mechanically ventilated dogs studied in the prone mouth open position. Computerised axial tomography (coronal plane) was used to measure the vertical distance between the tip of the epiglottis (E) and (1) the soft palate (SP) (i.e. E-SP distance) and (2) the dorsal wall of the nasopharynx (N) (i.e. E-N distance). Duplicate runs of graded electrical stimulation of the HE muscle, using bilateral bipolar fine wire electrodes, were performed in each animal and resulted in a progressive increase in both the E-SP distance (baseline of 0.5 +/- 0.5 to a maximum of 13.1 +/- 2.3 mm, mean +/- SE) and the E-N distance (29.1 +/- 2.0 to a maximum of 42.2 +/- 2.7 mm, both p < 0.02). We conclude that HE contraction moves the epiglottis ventrally away from the soft palate thus opening and enlarging the oral pathway for airflow.
我们在4只处于俯卧开口位、接受气管切开并机械通气的麻醉犬（静脉注射氯醛糖、戊巴比妥钠）身上，研究了下咽会厌肌（HE）收缩对会厌位置的影响。利用计算机断层扫描（冠状面）测量会厌尖（E）与（1）软腭（SP）之间的垂直距离（即E-SP距离）以及（2）鼻咽后壁（N）之间的垂直距离（即E-N距离）。对每只动物使用双侧双极细钢丝电极对HE肌进行分级电刺激，并重复操作，结果显示E-SP距离（基线为0.5±0.5至最大值13.1±2.3毫米，均值±标准误）和E-N距离（29.1±2.0至最大值42.2±2.7毫米）均逐渐增加（两者p<0.02）。我们得出结论，HE肌收缩使会厌腹侧远离软腭，从而打开并扩大气流的口腔通道。
