Everyone has ears. The ears we usually say in our daily life are actually narrow ears. Most of the time, they only mean outer ears. The broad sense of the ear also includes the middle ear and inner ear, and even the auditory nerve or auditory cortex behind the cochlea. Generally speaking, the ear is not only an auditory organ but also a sense organ. Its main function is to listen to the sound and keep the balance of the body.
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Three auditory ossicles in the ear
1. Although the ears are inconspicuous, the structure of the ears is extremely amazing
The three auditory ossicles (malleus, incus and stapes) in the ear are the smallest bones in the human body. They are connected end to end and are not as big as a coin. Although the space between middle ear and inner ear is very small, the structure is very complex, just like a maze.
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2. The ear canal will be renewed almost every year
The skin of the ear canal grows outwards at a rate of about 3.30cm every year, but falls off every year. If it doesn’t fall off, by the age of 20, the ear canal will be about 60.96 cm away from the ear.
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3. After wearing earphones for one hour, the bacteria in the ears increased by 700 times
Wearing earphones for a long time will affect the natural ventilation of the ear canal, thus making the ear canal become a hotbed for bacteria to grow. If the sound is too loud, it will damage the hearing. Therefore, it is better not to wear headphones more than half an hour a day.
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4. Ears still work when sleeping
The brain sometimes rests and blocks out external signals, but the ears constantly collect sound information, and sleep is no exception. When you wake up in the middle of the night, your brain is probably blank.
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5. Some dizziness is related to ears
The important function of the vestibular semicircular canal of the inner ear is to keep the balance of the body. Once the level of the inner lymph is disturbed, it will lead to dizziness. That’s why people feel dizzy when they spin too fast.
Eustachian tube is a channel connecting middle ear and nasopharynx. Under normal circumstances, it is open, which can make inner ear pressure and external air pressure reach a stable state. When yawning, the eustachian tube is closed, which will cause poor ventilation in the ear and insufficient air pressure in the ear, resulting in the same feeling of tightness and swelling as when taking an airplane or a high-altitude cable car, and feeling the abnormal sound.
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7. Ears can affect taste
The research shows that 28% ~ 80% of patients with middle ear surgery will have abnormal taste. This is because the chorda tympani nerve through the middle ear connects the taste buds and the brain. Once the ear is damaged, it is likely to affect the taste judgment ability.
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8. Loudspeaker may damage hearing
The normal voice of people is about 60 decibels. The most common cause of hearing loss is exposure to noise above 85 decibels, which is called “noise induced hearing loss”. The study found that sitting in front of a high-power speaker for only half a minute while listening to a concert may lead to irreversible hearing loss.
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9. Ears have self-cleaning function
The pores in the ear canal produce cerumen (commonly known as earwax and earwax), while the cilia in the ear canal push cerumen out of the ear canal. It’s better to protect the ear canal when spraying glue, otherwise it will affect the cerumen to fall off naturally and cause ear pain.
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