How Hearing Works
Normal Ear Function
- Sound is transmitted through the air as sound waves from the environment. The sound waves are gathered by the outer ear and sent down the ear canal to the eardrum.
- The sound waves cause the eardrum to vibrate, which sets the three tiny bones in the middle ear into motion.
- The motion of the three bones causes the fluid in the inner ear, or cochlea, to move.
- The movement of the fluid in the inner ear causes the hair cells in the cochlea to bend. The hair cells change the movement into electrical impulses.
- These electrical impulses are transmitted to the hearing (auditory) nerve and up to the brain, where they are interpreted as sound.
The Outer Ear
The part of the outer ear that we see is called the pinna, or auricle. The pinna, with its grooves and ridges, provides a natural volume boost for sounds in the 2000 to 3000 Hz frequency range, where we perceive many of the consonant sounds of speech.
The ear canal, also called the external auditory meatus, is the other important outer ear landmark. The ear canal is lined with a few layers of skin and very fine hair, and is a highly sensitive area. Wax (cerumen) accumulates in the ear canal and serves as a protective barrier to the skin from bacteria and moisture. Having ear wax is normal but if it accumulates and blocks the ear canal it can become a problem.
The Middle Ear
The eardrum, or tympanic membrane, is a thin three layer structure which divides the outer and middle ear systems.
The ossicles are three tiny bones in the middle ear located directly behind the tympanic membrane. These three bones form a connected chain in the middle ear. The largest of these bones is call the Malleus (hammer) is attached to the tympanic membrane and the smallest, the Stapes (stirrup) attaches to the vibratory plate called the oval window which separates the middle ear from the inner ear. The ossicles take mechanical energy received at the tympanic membrane and send it efficiently into the inner ear amplifying it along the way
The Eustachian tube is the middle ear's air pressure equalizing system. The middle ear is encased in bone and does not associate with outside air except through the Eustachian tube. This tubular structure is normally closed, but it can be involuntarily opened by swallowing, yawning, or chewing. It can also be intentionally opened to equalize pressure in the ears, such as when flying in an airplane. When this happens, you might hear a soft popping sound.
The Inner Ear
The inner ear is an organ located deep within the temporal bone, which is the bone of the skull on both sides of the head above the outer ear. The inner ear has two main structures: the semicircular canals and the cochlea.
- Semicircular canals - These structures do not contribute to hearing, but assist in maintaining balance as we move.
- Cochlea - This is the hearing organ of the inner ear, which is a fluid-filled structure that looks like a snail. The cochlea changes the mechanical vibrations from the tympanic membrane and the ossicles into a sequence of electrical impulses. Sensory cells, called hair cells, bend in the cochlea as the fluid is disrupted by the mechanical vibrations. This bending of the hair cells causes electrical signals to be sent to the brain by way of the auditory nerve. The cochlea is arranged by frequency, much like a piano, and encodes sounds from 20Hz (low pitch) to 20,000Hz (high pitch) in humans.