Sound and Oscillation

the human ear

The human ear is divided into three parts: the outer ear, the middle ear and the inner ear.

The divisions of the human ear

The human ear is responsible for our auditory sense.

Most of the hearing aid is concentrated inside the head. Our ears are subdivided into three parts:

• Outer ear – where the ear canal is.

• Middle ear or tympanic cavity – where the eardrum, incus, malleus and stirrup are found.

• Inner ear – where the stapes, auditory nerve and snail (also known as cochlea) are concentrated.

Upon reaching our external ears, sound waves travel through the ear canal until they reach the eardrum. This, in turn, vibrates when it identifies even very small pressure variations, caused by sound waves.

The vibrations of the eardrum tell two bones in the tympanic cavity (hammer and anvil) that there is a sound and these, then, trigger another bone (the stapes) that passes this information on to the inner ear.

As they pass through each of these obstacles, the sound waves are amplified and reach the ear snail.

The inner ear is made up of the snail-shaped cochlea. It contains tiny hairs that vibrate when sound propagates. This propagation occurs easily because of a liquid inside the inner ear, which stimulates the nerve cells of the auditory nerve, sending these signals to the brain, causing us to perceive sound.

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