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Anatomy of the ear
Transcript of Anatomy of the ear
OF THE EAR
How Hearing Works--Do you know sound moves in waves??
OTHER PARTS OF THE EAR
external auditory meatus a.k.a the ear canal
* illness during pregnancy
* childhood illnesses (mumps, measles, chicken pox)
* viral infections (meningitis)
* prolonged high fever
* physical damage to head or ear
* exposure to excessive or intense noise (loud music,
Person who studies the transmission of sound. An audiologist will test your hearing.
CAUSES OF A SENSORINEURAL HEARING LOSS
WHO CHECKS YOUR HEARING?
Many of the terms we will discuss come from the same root word: Audio
Audio – related to the transmission of sound.
ologist – person who studies.
meter – unit of measurement.
gram – chart or graph.
tympanic membrane or the ear drum
malleus, incus, stapes
hammer, anvil, stirrup
AUDIOGRAMS of CONDUCTIVE and SENSORINEURAL
The Eustachian tube is another part of the middle ear.
It allows air in or out of the middle ear when a person swallows or yawns.
The Semicircular Canals are attached to the outside of the cochlea.
They help with balance and the feeling of movement.
TWO KINDS OF HEARING LOSS
CONDUCTIVE: sound is not conducted through the outer ear canal to the eardrum and the tiny bones of the middle ear
SENSORINEURAL: damage in the inner ear, or to the nerve pathways from the inner ear to the brain
MIXED: combination of conductive & sensorineural
* infections that fill the middle ear with fluid
* ruptured eardrum
* interference (such as build-up of wax)
* a change in the shape of the ear structures
* damage caused by a foreign object (i.e. a pencil, stick)
* missing or occluded (obstructed) ear canal
WHAT DOES AN AUDIOLOGIST USE TO MEASURE YOUR HEARING?
A machine used to measure hearing through the transmission of sound.
It measures high tones and low tones. It measures loud sounds and soft sounds.
A graph that shows the measure of sound transmitted.
The audiologist will write down what you hear on an audiogram
CAUSES OF A CONDUCTIVE
How Do We Hear?
The pinna (auricle)
catches the sound
The sound waves travel
through the ear canal.
The ear canal is also
called the EXTERNAL
The sound vibrations
cause the eardrum or
The middle ear consists of a small air-filled space. Inside this space are 3 small bones, called OSSICLES.
The COCHLEA is a snail-shaped
organ where vibrations change
into nerve energy. When the
OSSICLES move, they put pressure
on the fluid filled cochlea. The
hair cells in the cochlea bend
and change sound vibrations
into nerve energy.
The nerve impulse
travels through the
auditory nerve to the
portion of the brain
that receives and
understands the nerve
impulse from the ear.
SENSORINEURAL HEARING LOSS
A hearing loss in the
outer or middle ear is
called a conductive
A hearing loss in the inner ear or auditory nerve is called a sensorineural hearing loss.