耳廓软骨支撑着垂直耳道，而在远侧居中分部的水平耳道则由环形软骨包围。
The auricular cartilage supports the vertical canal while the horizontal canal, coursing medially and distally, is surrounded by annular cartilage.
结论：以同种异体肋软骨对乳突根治术后耳行外耳道后壁及听力重建术，是防止乳突腔感染，提高听力的较理想方法。
Conclusion: Reconstruction of acusticus back wall and hearing after radical mastoidectomy with homograft costal cartilage is effective to prevent mastoid cavity infection and improve hearing.
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