结果：甲咽肌在咽后壁的厚度由上而下逐渐减小；
Results: The thickness of thyropharyngeal muscle in pharynx posterior wall was reduced.
吻合口紧张时，可切除喉前带状肌，部分甲状舌骨膜及咽缩肌。
When tallies tight-lipped, before may excise the throat, the belt-shaped muscle, the partial armor shape tongue periosteum and swallows the constrictor.
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