1. 12.5: Hearing: External Ear
Sponge: Set up Cornell Notes on pg. 53 Topic: 12.5: Hearing: External Ear Essential Questions: What is the major function of the cerumen?
12.5: Hearing: External Ear
2.1 Atoms, Ions, and Molecules

2. REVIEW: Special Senses
Location of special senses?
Sensory receptors are within large, complex sensory organs in the head
Hearing in ears------>hair cells

3. Overview of the Ear and Hearing 1m44s
P. 52 Video notes 1-3 bullets

4. Hearing
Ear – organ of hearing
Three Sections
External
Middle
Inner

5. Sound Waves and Our Ears (3m 28s)
P. 52 Video notes 3-5 bullets

6. External Ear
The external ear consists of all of the structures that face the outside
Auricle (oar-i-cle)
Funnel like structure
Collects sounds waves traveling through the air
Directs them into the external acoustic meatus (me-a-tus)

7. External acoustic meatus (me-a-tus) aka “ear canal”
Passes into temporal bone
Carries sound to tympanic membrane (ear drum)
Lined with ceruminous (ser-room-inous) glands which secrete wax
Protects, lubricates and cleans the ear
Hairs guard the tube
Hair and wax keep large foreign objects, such as bugs, out of the ear
A tickling on the ear drum

8. CAUTION!!!!!

9. Cerumen Impaction 3m6s P. 52 Video notes 3-5 bullets

10. Otitis Externa “Outer Ear Infection”
Otitis Externa aka “Outer ear infection” aka “Swimmer’s Ear”
Inflammation of the outer ear and ear canal
Swells and becomes tender to the touch
Can be caused by bacteria or fungus
Ear Canal almost swollen shut

11. Otitis Externa “Outer Ear Infection”

12. Tympanic membrane aka ear drum
Vibrates in response to sound waves
Reproduces the vibrations of the sound-wave source

13. The Outer and Middle Ear (3m28s)
P. 52 Video notes 3-5 bullets

14. Color code each of the 3 parts (include key)

15. Now Hear This: Don’t Remove Earwax Reading
Read/Highlight/ Answer Questions
Class Discussion

16. Pg. 52 On pg. 52 Create Picture Bubble Map Color code to match notes
Add the FUNCTION to each label