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A:我们的耳朵由外耳、中耳和内耳三个部分组成,中耳是传导声波的主要部分。鼓室是中耳的核心组成部分,它是一个不规则的空腔结构,体积不超过2毫升,有上、下、前、后、内侧、外侧共六个壁,各壁都有其不同性质的重要结构,功能也各不相同。在鼓室的前壁上,有一个小孔通向一条直接与外界相通的管道,管道的另一端是鼻咽部,故这条连通鼓室与鼻咽部的交通要道被称为“咽鼓管”。咽鼓管长3.5~4.0厘米,在通向鼻咽部的一端一般处于紧闭状态,当我们尽力张口、吞咽、咀嚼或打呵欠时开放,这时空气便经由咽鼓管进入鼓室使鼓膜内、外两侧的气压平衡。一般情况下,鼓室内的压力与大气压力保持平衡,从而保证鼓膜能够正常振动。当我们乘坐飞机愈升愈高时,外界的大气压力会随着高度的升高而逐渐降低,这时飞机就会启动压力调节系
A: Our ears are composed of three parts: the outer ear, the middle ear and the inner ear. The middle ear is the main part of the conductive sound wave. The tympanic cavity is the central part of the middle ear, it is an irregular cavity structure, the volume does not exceed 2 ml, up, down, front, back, inside, outside a total of six walls, each wall has its own different nature Important structure, function is also different. In the front wall of the tympanic cavity, there is a small hole leads to a pipe directly connected with the outside world, the other end of the pipe is the nasopharynx, so this communication between the tympanic and nasopharynx is called tube". Eustachian tube length 3.5 ~ 4.0 cm, at the end leading to the nasopharynx is generally closed, when we try to mouth, swallowing, chewing or yawning open, then the air will be through the eustachian tube into the tympanic within the tympanic membrane , The pressure on both sides of the balance. Under normal circumstances, the tympanic chamber pressure and atmospheric pressure to maintain balance in order to ensure the normal vibration of the tympanic membrane. When we fly higher and higher aircraft, the outside world’s atmospheric pressure will gradually decrease with the height increase, then the aircraft will start the pressure regulation system