The sound-conducting apparatus in the middle-ear of domestic fowls includes the membrana tympani, columella, musculus tensor tympani and several ligaments.

鸭的中耳传声器官主要包括：鼓膜、听骨、张肌及韧带四部分。

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Conclusion All of the three types of membrana tectoria esophageal stent adapt to relieve the esophageal carcinoma narrow obstruction and make the orificium fistulae seal.

结论三种类型覆膜食管支架均适应于食管癌狭窄梗阻解除及瘘口封堵；

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