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3.04 Functions and disorders of the ear. 3.04 Understand the functions and disorders of the sensory system. Essential Questions What are the functions of the sensory system? What are some disorders of the sensory system? How are sensory system disorders treated?

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3 04 functions and disorders of the ear

3.04 Functions and disorders of the ear

3.04 Understand the functions and disorders of the sensory system

3 04 understand the functions and disorders of the sensory system

3.04 Understand the functions and disorders of the sensory system

  • Essential Questions
  • What are the functions of the sensory system?
  • What are some disorders of the sensory system?
  • How are sensory system disorders treated?
  • How do you relate the body’s communication to the sensory system?

3.04 Understand the functions and disorders of the sensory system

understanding the functions of the ear hearing
Understanding the functions of the ear: Hearing

3.04 Understand the functions and disorders of the sensory system

understanding the functions of the ear
Understanding the functions of the ear

External ear

  • Pinna: collects sound waves and sends them to auditory canal
  • External auditory canal
    • Contains cerumen: protects ear (oily, wax like substance)
  • Tympanic membrane: separates outer and middle ear

3.04 Understand the functions and disorders of the sensory system

understanding the functions of the ear1
Understanding the functions of the ear

Middle ear: cavity in the temporal bone

Ossicles: transmits sounds waves from ear drum to inner ear

1. Hammer: malleus

2. Anvil: incus

3. Stirrups: stapes

Eustachian tube: connects to the pharynx (equalizes pressure in the middle ear with the outside

3.04 Understand the functions and disorders of the sensory system

understanding the functions of the ear2
Understanding the functions of the ear

Inner ear

Cochlea: filled with fluid that vibrates when the sound waves from the stirrup bone strike against it

Semicircular canals: liquid and hair like structures bend when set in motion by head and body movements  impulses sent to cerebellum; help maintain balance & equilibrium

3.04 Understand the functions and disorders of the sensory system

understanding the functions of the ear3
Understanding the functions of the ear

Pathway of hearing

Trace the pathway of hearing.

Discuss the process of hearing.

What are decibels?

Sound measured in decibels (dB): faintest sound is labeled dB whereas a jet engine is 165dB. Exposure to anything over 90dB for 8 hrs may be dangerous to your hearing.

3.04 Understand the functions and disorders of the sensory system

understanding the functions of the ear what is occurring at each structure
Understanding the functions of the ear What is occurring at each structure?

Review the pathway of hearing

3.04 Understand the functions and disorders of the sensory system

healthy hearing
Healthy Hearing

Listening to loud noises over a long period of time damage

hair in the organ of Corti (cochlea). It destroys receptors and nerve

cells and the damage is permanent.

How do you protect your hearing?

What is the relevance to healthy hearing?

3.04 Understand the functions and disorders of the sensory system

understanding the functions of the ear4
Understanding the functions of the ear

Short bit of sound or clip from a longer recording.

Sound Activity

What is a sound byte?

3.04 Understand the functions and disorders of the sensory system

disorders of the ear
Disorders of the ear

3.04 Understand the functions and disorders of the sensory system

disorders of the ear1
Disorders of the ear

What instruments are used to examine the ear?

What specialist studies the ears, nose, and throat?

3.04 Understand the functions and disorders of the sensory system

disorders of the ear external otitis
Disorders of the ear External otitis

Discuss what you see in this picture? (Besides a Q-tip!)

What causes external otitis?

How can it be prevented?

3.04 Understand the functions and disorders of the sensory system

disorders of the ear2
Disorders of the ear

Normal tympanic membrane

Otitis media

Myringotomy

Otitis media

What is otitis media?

Ear infection of middle ear

Who is most at risk of having

otitis media? Why?

Children; eustachian tube is shorter so common colds create pressure because of fluid to build up behind the tympanic membrane

What are the treatment options?

Antibiotics or a myringotomy

3.04 Understand the functions and disorders of the sensory system

disorders of the ear3
Disorders of the ear

Otosclerosis

  • What is it?
    • Oto- sclerosis
  • Stapes bone becomes hard making it unmovable. Common cause of hearing loss in young adults.
  • What causes it?

Inherited disorder

  • Why is a stapedectomy useful in treating otosclerosis?
  • Total replacement of the stapes

3.04 Understand the functions and disorders of the sensory system

disorders of the ear4
Disorders of the ear

Meniere’s disease

What are the symptoms of Meniere’s disease?

Vertigo (dizziness)

What causes these symptoms?

Pressure and swelling distorts balance info sent to the cerebellum

How is it treated?

Avoid salt, caffeine, nictoine. Medicines to treat dizziness and nausea. Bedrest and drinking plenty of water.

3.04 Understand the functions and disorders of the sensory system

disorders of the ear5
Disorders of the ear

Sign of hearing loss

Tinnitus

  • What is tinnitus?
  • Ringing in ears

Explain this statement:

Tinnitus is a symptom, not a disorder.

3.04 Understand the functions and disorders of the sensory system

disorders of the ear6
Disorders of the ear

What is the difference between

conductive hearing loss and

sensory hearing loss?

How can they be treated?

Presbycusis

What is presbycusis?

Deafness due to aging

Conductive hearing loss?

Sounds to the inner ear are blocked by wax or fluid in the middle ear or abnormal bone growth

Sensory hearing loss?

Damage to inner ear or auditory nerves; treatment is cochlear implants

3.04 Understand the functions and disorders of the sensory system

testing for hearing loss
Testing for hearing loss

Rinne test

Weber test

Compare these two tests.

How are they diagnostic?

3.04 Understand the functions and disorders of the sensory system

3 04 understand the functions and disorders of the sensory system1

3.04 Understand the functions and disorders of the sensory system

  • Essential Questions
  • What are the functions of the sensory system?
  • What are some disorders of the sensory system?
  • How are sensory system disorders treated?
  • How do you relate the body’s communication to the sensory system?

3.04 Understand the functions and disorders of the sensory system

3 04 functions and disorders of the ear1

3.04 Functions and disorders of the ear

The End

3.04 Understand the functions and disorders of the sensory system