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Structure of Human Ear and Hearing Aid

Structure of Human Ear :

Humans are privileged as they are able to hear with the help of an extremely sensitive device known as the “Ear”.

We receive audible frequencies from our surrounding which is then converted into electrical signals that are passed through a special nerve called “Auditory Nerve” to our brain.

The brain interprets the received signals and responds accordingly.

Auditory parts of the human ear are as follows :

 The human ear comprises the outer ear, middle ear, and the inner ear.

1. Outer Ear :

 Pinna – The outer part of the ear which collects sound from the environment of surroundings.

 Auditory Canal – The sound that is collected from the surrounding are passed through the auditory canal.

 Eardrum or Tympanic Membrane – This is a thin membrane that is located at the end of the auditory canal.

The eardrum when receives a compression moves inward because of increased pressure. Similarly, when it receives rarefaction it moves outward due to a decrease in pressure.

As a result, the eardrum starts to vibrate inwards and outwards on receiving a sound wave.

2. Middle Ear :

It consists of three bones (hammer, anvil, and stirrup). These bones amplify vibration several times and transmit the amplified pressure variations to the inner ear.

3. Inner Ear :

The pressure variation received from the middle ear is turned into electrical signals by “Cochlea” which are then sent to the brain via the auditory nerve.

The brain interprets the received electrical signals into sound which we perceive.

Hearing Aid :

Some of the people who are differently-abled can suffer from hearing loss which needs a proper appliance that can help them deal with this loss and for that “Hearing Aid” is needed.

A hearing aid is a battery-operated, an electronic device that receives sound from the atmosphere and converts it into electrical signals.

These electrical signals or energy is passed by an amplifier which amplifies it to a sound and then transfers it to a speaker.

The speaker then converts electrical signals into sound waves that are further being sent to the ears, due to which we can hear clearly.

 

        

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