了解耳朵里的小秘密–外耳道篇

As the saying goes: “One is deaf and three is silly”, which shows the importance of the human auditory system.Therefore, for hearing rehabilitation workers, they should first be proficient in the basic physiological anatomical structure and functional characteristics of the human ear.

人耳听觉系统主要分为三个部分:外耳、中耳和内耳,今天,小欧带大家了解一下我们最熟悉

最熟悉的耳廓

<说起听力系统,大家最熟悉的就是外耳,特别是耳廓部分,其实外耳还包括外耳道,耳廓和外耳道是外耳的

耳廓主要具有收集声音的作用。
Binaural cooperation can achieve the effect of sound source positioning and binaural auditory balance stereo.
The auricle is composed of cartilage and the surface is covered with skin.The auricle not only has fewer blood vessels, but also has less fat layer. Therefore, the auricle is prone to frostbite in the cold winter.

其中,外1/3为软骨部,内2/3为骨部。软骨部皮肤较厚,有丰富的毛囊、皮脂腺和耵聍腺(分泌耵聍)。骨部皮肤相对较为菲薄。成人外耳道并不是直线状的,而是呈“S”形的。从外向内,先向前上,然后稍向后,最后向前下。外耳道有两处狭窄:一处是骨部与软骨部的交界处,另外一处则是骨部距离鼓膜约0.5cm处,此处被称为外耳道峡。

世界上有两种东西是忍不住的—咳嗽和爱情

检查时为什么会想咳嗽?

在外耳道底部、耳道入口和峡部之间,有迷走神经的分支,所以在制取印模、耳镜检查和佩戴助听器时,如果刚好碰到有迷走神经末梢分布的外耳道后壁,有时会出现反射性咳嗽。
不过无需担心,只要停止刺激该分区,咳嗽自然就会停止了。

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