1. 3.04 Functions and disorders of the ear
3.04 Understand the functions and disorders of the sensory system

2. 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. Understanding the functions of the ear: Hearing
3.04 Understand the functions and disorders of the sensory system

4. Understanding the functions of the ear
External ear
Pinna: conducts sound
External auditory canal
Ear canal
Contains cerumen
Tympanic membrane: separates
the outer and middle ear
3.04 Understand the functions and disorders of the sensory system

5. Understanding the functions of the ear
Middle ear
Ossicles: name
transmits sound from ear drum to inner ear
Eustachian tube: equalizes pressure
3.04 Understand the functions and disorders of the sensory system

6. Understanding the functions of the ear
Inner ear
Cochlea: organ for hearing,
Organ of Corti: delicte hairlike structures that pick up vibrations of fluid transmit them as sensory impulse
Semicircular canals:3 structures that contains liquid set in motion with movement of head and body. Helps maintain equilibrium
3.04 Understand the functions and disorders of the sensory system

7. Understanding the functions of the ear
Pathway of hearing
Trace the pathway of hearing.
Discuss the process of hearing.
What are decibels?
3.04 Understand the functions and disorders of the sensory system

8. Review the pathway of hearing
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

9. Healthy Hearing How do you protect your hearing?
What is the relevance to healthy hearing?
3.04 Understand the functions and disorders of the sensory system

10. Understanding the functions of the ear
Sound Activity
What is a sound byte?
Short bit of sound or clip from a longer recording.
3.04 Understand the functions and disorders of the sensory system

11. 3.04 Understand the functions and disorders of the sensory system
Disorders of the ear
3.04 Understand the functions and disorders of the sensory system

12. 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

13. 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

14. Disorders of the ear Otitis media What is otitis media? Who is most at
risk of having
otitis media? Why?
What are the treatment options?
Normal tympanic membrane
Otitis media
Myringotomy
3.04 Understand the functions and disorders of the sensory system

15. 3.04 Understand the functions and disorders of the sensory system

16. 3.04 Understand the functions and disorders of the sensory system
Perforated Eardrum
3.04 Understand the functions and disorders of the sensory system

17. 3.04 Understand the functions and disorders of the sensory system
What instrument would a physician use to examine the inner ear?
3.04 Understand the functions and disorders of the sensory system

18. 3.04 Understand the functions and disorders of the sensory system
Disorders of the ear
Otosclerosis
What is it?
Oto- sclerosis
What causes it?
Why is a stapedectomy useful in treating otosclerosis?
3.04 Understand the functions and disorders of the sensory system

19. 3.04 Understand the functions and disorders of the sensory system
The bone stapes of the middle ear become sponge and then harden. The stapes becomes fixed and immovable.
Inherited disorder
Stapedectomy is total replacement of the stapes
3.04 Understand the functions and disorders of the sensory system

20. 3.04 Understand the functions and disorders of the sensory system
Disorders of the ear
Meniere’s disease
What are the symptoms of Meniere’s disease?
What causes these symptoms?
How is it treated?
3.04 Understand the functions and disorders of the sensory system

21. 3.04 Understand the functions and disorders of the sensory system
Affects the semicircular canals of the inner ear
Marked vertigo, nausea, vomiting, tinnitus
Bedrest, medication to relieve vertigo and nausea
Avoid salt, caffeine and nicotine, balanced diet, fluids
3.04 Understand the functions and disorders of the sensory system

22. 3.04 Understand the functions and disorders of the sensory system
Disorders of the ear
Tinnitus
What is tinnitus?
Explain this statement:
Tinnitus is a symptom, not a disorder.
3.04 Understand the functions and disorders of the sensory system

23. 3.04 Understand the functions and disorders of the sensory system
“Ringing in the ears”
The microscopic hairs are bent or broken and in a constant state of irritation which are interpreted by the auditory neurons and the brain as a” ringing”
Most likely cause is loud noise, impacted wax, otitis media or salicylate use
3.04 Understand the functions and disorders of the sensory system

24. Disorders of the ear Presbycusis What is presbycusis?
Who is most likely to develop presbycusis?
What is the difference between
conductive hearing loss and
sensory hearing loss?
How can they be treated?
3.04 Understand the functions and disorders of the sensory system

25. 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

26. 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

27. 3.04 Functions and disorders of the ear
The End
3.04 Understand the functions and disorders of the sensory system