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THE HUMAN EAR

THE HUMAN EAR. Dr. Lesley Dinoff. THE HUMAN EAR. The ear is made up of three parts: – Outer –Middle –Inner Each part of the ear works together to help us hear. OUTER EAR. The outer ear is comprised of the visible portion of the ear, called the Pinna, the ear canal, and the eardrum .

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THE HUMAN EAR

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  1. THE HUMAN EAR • Dr. Lesley Dinoff

  2. THE HUMAN EAR • The ear is made up of three parts: • –Outer • –Middle • –Inner • Each part of the ear works together to • help us hear.

  3. OUTER EAR • The outer ear is comprised of the visible portion of the ear, called the Pinna, the ear canal, and the eardrum. • The Pinna collects the sounds from our environment like a funnel and transmits them through the ear canal to the eardrum.

  4. OUTER EAR • Sound vibrations reach the eardrum, they make it vibrate and the vibrations are passed on to the middle ear. • Glands in the outer portion of the ear canal form earwax, which is designed to lubricate the canal and collect dirt and dust, and protect the eardrum.

  5. OUTER EAR • Earwax disposes of itself naturally. Cotton swabs should never be used inside the ears as they can injure the very sensitive skin of the ear canal and simply push the wax deeper into the ear. This impairs the ear's natural cleaning process.

  6. MIDDLE EAR • The vibrations of the eardrum are intensified by a chain of small bones in the middle ear (called the hammer, anvil, and stirrup because of their shapes), connecting the eardrum to the inner ear. • The Eustachian tube connects the middle ear space to the back of the throat and nose. As external air pressure changes, the middle ear needs to adjust. You feel this when you are in an elevator or airplane.

  7. INNER EAR • The inner ear is comprised of the balance organ and the cochlea. The cochlea (Latin for the word 'snail') is a hollow tube that is coiled into the shape of a snail. • It operates like a microphone, converting vibrations into impulses, which are sent to the brain and identified as sounds such as speech, music, or street noise.

  8. INNER EAR • Above the cochlea is the balance organ, Semi-circular canals…which responds to changes in body movement. • Disturbances of this organ when sailing may result in dizziness and nausea as changes in motion send conflicting messages to the brain.

  9. INNER EAR

  10. LOUD SOUNDS • Can make your ears ring. (Tinnitus) • Can break the hair cells. • Once your hair cells are broken, they can never be fixed. • When hair cells are broken, you will not be able to hear fine.

  11. Tinnitus….It can be described as ringing, whistling, buzzing

  12. HEALTHY EARS • DO NOT listen to loud music. • Try not to turn the TV too loud. • Make sure you wear ear plugs if you go to concerts, car races, or out in the lawn when the grass is being cut. • If you hunt wear ear plugs

  13. CAN BE TOO LOUD • Guns • Music • – iPods • – Boom Box Cars • Fireworks • Work environments • Many other things

  14. Signs of excessive noiseexposure • Ears ring (tinnitus) • Ears feel full or deadened • Do not hear as well for a while • (temporary threshold shift)

  15. What Happens If WeLoose Our Hearing? • Cannot localize (find things). • Cannot communicate with others. • Cannot enjoy music. • Can become very lonely and sad. • Cannot enjoy our daily lives as much. • Cannot recognize objects, voices, etc.

  16. Hearing Protection Devices • Used to make the level of sound coming into the ear softer. • Different types • –Earplugs • –Earmuffs • –Helmets

  17. How long can I be aroundloud sounds w/o damage? • 90 dB – 8 hours (classical music recital) • 95 dB – 4 hours (gas leaf blower) • 100 dB – 2 hours (cheap lawn mower) • 105 dB – 1 hour (rock concert) • 110 dB – 30 minutes (common w/ iPods) • 115 dB – 15 minutes (boom box cars)

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