对外耳道错误的描述是A.全长2.5~3.5cmB.由外耳道口直行至鼓膜C.外耳道的外1/3为软骨部,内2/3为骨部,外面被覆皮肤D.软骨部皮肤...

作者: rantiku 人气: - 评论: 0
问题 对外耳道错误的描述是
选项 A.全长2.5~3.5cm B.由外耳道口直行至鼓膜 C.外耳道的外1/3为软骨部,内2/3为骨部,外面被覆皮肤 D.软骨部皮肤富有皮脂腺和耵聍腺 E.软骨部皮肤皮下组织少
答案 B
解析 :为外耳道口至鼓膜之间的管道,全长2.5~3.5cm,走行弯曲,故进行外耳道检查时在成人要向后上方牵拉耳廓,在儿童向后下方牵拉耳廓,方能使外耳道变直、充分暴露。外耳道的外1/3为软骨部,内2/3为骨部,外面被覆皮肤。软骨部皮肤富有细毛、皮脂腺和耵聍腺,易于发生炎症,而且因皮下组织甚少,水肿时张力高,疼痛剧烈。

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