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.