Yawning is a movement or activity that everyone has in their daily life. Some time it embarrassing people during important lectures and corporate meetings. It produces or shows a feeling of calmness and sleepiness. and you face hearing loss or hard to hear when you’re yawning.
While yawning you don`t hear any sound. Ever surprise why you don`t hear the sound?
In other words, It is related to Eustachian tube. It links the back of the throat and the middle ear and allows air pressure to equalize in the middle ear. When you yawn, then the air pressure goes up and it turns the eardrum and gives notice of the loss (notice, just impaired and do not stop). Yawn also helps in opening the Eustachian tube.
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A human ear amplifies sound waves that pass through the ear canal to the eardrum. Then it mechanically vibrates bones of the ear which is malleus, incus as well as stapes. After that stapes transfer mechanical energy or vibration into the cochlea. And cochlea is filled with fluid which is known as endolymph. After that, it comes in contact with hair cell and it produces impulses which are interpreted by the human brain as a sound that we hear.
Why no sounds while Yawning?
We do not hear any external sound when we are yawning because the eustachian tube is open. And the source of sound is ear canal or eustachian tube. A sound which passes through eustachian tube fills up a middle ear. It reduces the ear ability to amplify sounds which it passes through an ear canal. Because of this reason, you can’t hear or hard to hear when you’re yawning. And also we hear our internal sound.
The opening of the tube is temporary while yawning, some people develop it purposely.
How does Human Ear Work?
The human ear works by increasing the sound waves which reach the eardrum through the ear canal. The eardrum then mechanically vibrates the three small bones of the ear, the Malleus the Incus, and the steps. Stages ultimately transmit this mechanical energy into the cochlea, which is filled with a fluid called endolymph, which when exposed to hair cells, the impulse described by the brain as a sound produces.
Eustachian tube:
The eustachian tube connects the middle ear with a back of the nasal cavity. It performs various physical activities such as yawning chewing and swallowing, open eustachian tube and also allow air to enter or escape from the middle ear. It also allows the human body to normalize air pressure in the ear. This tube releases pressure and balances the pressure when necessary. While traveling in the plane there is a necessity to maintain the pressure in the ear. Due to the Eustachian tube, it is possible to maintain that pressure.
Tensor tympani muscle:
When any people yawn both tensor tympani, as well as stapedius muscles, get tighten. Both of these muscles control the amount of sound entering in our ear. The function of these two muscles is similar to the function of iris. When you suddenly come from a dark room to well-lited room. Than your iris regulates the amount of light entering the retina. As similar iris tightness of tensor tympani muscles reduces ossicular chain ability to pass all vibration of an eardrum to the inner ear. Because of this deafness occur when you yawn.
What Causes Yawning?
Yawing is a highly involuntary process of mouth opening and deep breathing, filling the lungs with air. It is a very natural reaction to being tired. In fact, yawning usually happens with sleep or fatigue. Some yawn is small, and some open mouths stay for several seconds before leaving the breath. Water can be with eyes, pulling or audible sighs yawning.
That is the reason that yawning can really be problematic. Especially if you are listening to important information that should not be repeated. Even if it feels great, sometimes it is better to fight yawn!