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Hearing in Adults

Hearing in grandma

Hearing is one of our five senses. It is a complex process of picking up sound and attaching meaning to it. The ability to hear is critical to understanding the world around us. The human ear is a fully developed part of our bodies at birth and has the ability to respond to sounds that are very faint as well as sounds that are very loud. Even before birth, infants respond to sound.

How do we hear→

How hearing works

The ear can be divided into three parts leading up to the brain: the outer ear, middle ear and the inner ear.

  • The outer ear consists of the ear canal and eardrum. Sound travels down the ear canal, striking the eardrum and causing it to move or vibrate.
  • The middle ear is a space behind the eardrum that contains three small bones called ossicles. This chain of tiny bones is connected to the eardrum at one end and to an opening to the inner ear at the other end. Vibrations from the eardrum cause the ossicles to vibrate which, in turn, creates movement of the fluid in the inner ear.
  • Movement of the fluid in the inner ear, called the cochlea, causes changes in tiny structures called hair cells. This movement of the hair cells sends electric signals from the inner ear up the auditory nerve (also known as the hearing nerve) to the brain.
  • The brain then interprets these electrical signals as sound.

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