The sound-conducting apparatus in the middle-ear of domestic fowls includes the membrana tympani, columella, musculus tensortympani 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。
2
The tensortympani muscle, middle meningeal artery and mandibular nerve are good landmarks to predict and identify the horizontal segment of the internal carotid artery.