在左肺下叶支气管层面上，上段支气管发出。
On the section through left inferior lobar bronchus, superior segmenta1 bronchus appeared.
目的：为左肺下叶支气管的CT显示提供应用解剖学基础。
Objective:To provide the applied anatomic basis for CT demonstration in left lower lobar bronchus.
由于存在着解剖上的差异，右下叶支气管异物较左侧的多。
Because of the anatomical difference, the foreign bodies usually saw in right lower lobar bronchus.
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